扫一扫
关注中图网
官方微博
本类五星书更多>
-
>
西班牙语词根宝典
-
>
英语大书虫世界经典名译典藏书系:中国人的精神 (英汉对照)(精选权威版本)
-
>
许渊冲译唐诗三百首:汉文·英语
-
>
四级词汇词根+联想记忆法:乱序版
-
>
The secret garden
-
>
英国文学名篇选注
-
>
许渊冲译千家诗
数据与计算机通信-(第九版)-英文版 版权信息
- ISBN：9787121229534
- 条形码：9787121229534 ; 978-7-121-22953-4
- 装帧：一般胶版纸
- 册数：暂无
- 重量：暂无
- 所属分类：>>
数据与计算机通信-(第九版)-英文版 本书特色
本书是著名计算机专业作家william stallings的经典著作之一，内容涉及基本的数据通信原理、各种类型的计算机网络以及多种网络协议和应用，覆盖面广，信息量大。这一版对上一版内容做了许多改进，使新版对通信领域各专题的阐述更清晰、更紧凑。同时，新版补充了双绞线传输标准、宽带因特网接入、第四代移动无线网络、虚拟局域网、移动ip等内容，修订了高速以太网、无线局域网、mpls的相关内容，彻底重写了安全相关章节。此外，本书还包括术语表、参考文献、缩写词对照表。每章都附有习题和推荐读物，以便读者进一步阅读。
数据与计算机通信-(第九版)-英文版 内容简介
本书是著名计算机专业作家William Stallings的经典著作之一，内容涉及基本的数据通信原理、各种类型的计算机网络以及多种网络协议和应用，覆盖面广，信息量大。这一版对上一版内容做了许多改进，使新版对通信领域各专题的阐述更清晰、更紧凑。同时，新版补充了双绞线传输标准、宽带因特网接入、第四代移动无线网络、虚拟局域网、移动IP等内容，修订了高速以太网、无线局域网、MPLS的相关内容，彻底重写了安全相关章节。此外，本书还包括术语表、参考文献、缩写词对照表。每章都附有习题和推荐读物，以便读者进一步阅读。
数据与计算机通信-(第九版)-英文版 目录
contents
chapter0reader’sandinstructor’sguide1
0.1outlineofthebook2
0.2aroadmapforreadersandinstructors3
0.3internetandwebresources5
0.4standards6
partoneoverview8
chapter1datacommunications,datanetworks,andtheinternet8
1.1datacommunicationsandnetworkingfortoday’senterprise9
1.2acommunicationsmodel16
1.3datacommunications19
1.4networks22
1.5theinternet25
1.6anexampleconfiguration30
chapter2protocolarchitecture,tcp/ip,andinternet-basedapplications32
2.1theneedforaprotocolarchitecture33
2.2asimpleprotocolarchitecture34
2.3thetcp/ipprotocolarchitecture38
2.4standardizationwithinaprotocolarchitecture46
2.5traditionalinternet-basedapplications49
2.6multimedia50
2.7recommendedreadingandwebsites53
2.8keyterms,reviewquestions,andproblems54
appendix2athetrivialfiletransferprotocol57
parttwodatacommunications62
chapter3datatransmission62
3.1conceptsandterminology64
3.2analoganddigitaldatatransmission75
3.3transmissionimpairments83
3.4channelcapacity89
3.5recommendedreadingandwebsite93
3.6keyterms,reviewquestions,andproblems94
appendix3adecibelsandsignalstrength97
chapter4transmissionmedia100
4.1guidedtransmissionmedia102
4.2wirelesstransmission116
4.3wirelesspropagation124
4.4line-of-sighttransmission129
4.5recommendedreadingandwebsites133
4.6keyterms,reviewquestions,andproblems134
chapter5signalencodingtechniques138
5.1digitaldata,digitalsignals141
5.2digitaldata,analogsignals151
5.3analogdata,digitalsignals162
5.4analogdata,analogsignals168
5.5recommendedreading175
5.6keyterms,reviewquestions,andproblems175
chapter6digitaldatacommunicationtechniques180
6.1asynchronousandsynchronoustransmission182
6.2typesoferrors186
6.3errordetection186
6.4errorcorrection196
6.5lineconfigurations202
6.6recommendedreading203
6.7keyterms,reviewquestions,andproblems204
chapter7datalinkcontrolprotocols208
7.1flowcontrol210
7.2errorcontrol217
7.3high-leveldatalinkcontrol(hdlc)223
7.4recommendedreading230
7.5keyterms,reviewquestions,andproblems230
appendix7aperformanceissues233
chapter8multiplexing268
8.1frequencydivisionmultiplexing243
8.2synchronoustimedivisionmultiplexing249
8.3statisticaltimedivisionmultiplexing259
8.4asymmetricdigitalsubscriberline266
8.5xdsl298
8.6recommendedreadingandwebsites272
8.7keyterms,reviewquestions,andproblems273
chapter9spreadspectrum276
9.1theconceptofspreadspectrum278
9.2frequency-hoppingspreadspectrum279
9.3directsequencespreadspectrum284
9.4codedivisionmultipleaccess290
9.5recommendedreadingandwebsite294
9.6keyterms,reviewquestions,andproblems294
partthreewideareanetworks298
chapter10circuitswitchingandpacketswitching298
10.1switchedcommunicationsnetworks300
10.2circuit-switchingnetworks302
10.3circuit-switchingconcepts305
10.4softswitcharchitecture309
10.5packet-switchingprinciples310
10.6recommendedreading320
10.7keyterms,reviewquestions,andproblems320
chapter11asynchronoustransfermode323
11.1theroleofatm325
11.2protocolarchitecture326
11.3atmlogicalconnections328
11.4atmcells333
11.5transmissionofatmcells339
11.6atmservicecategories343
11.7recommendedreadingandwebsites346
11.8keyterms,reviewquestions,andproblems347
chapter12routinginswitcheddatanetworks350
12.1routinginpacket-switchingnetworks351
12.2examples:routinginarpanet361
12.3least-costalgorithms367
12.4recommendedreading372
12.5keyterms,reviewquestions,andproblems373
chapter13congestioncontrolindatanetworks377
13.1effectsofcongestion379
13.2congestioncontrol384
13.3trafficmanagement386
13.4congestioncontrolinpacket-switchingnetworks388
13.5atmtrafficmanagement388
13.6atm–gfrtrafficmanagement400
13.7recommendedreading403
13.8keyterms,reviewquestions,andproblems404
chapter14cellularwirelessnetworks407
14.1principlesofcellularnetworks408
14.2first-generationanalog422
14.3second-generationcdma423
14.4third-generationsystems429
14.5fourth-generationsystems433
14.6recommendedreadingandwebsites438
14.7keyterms,reviewquestions,andproblems439
partfourlocalareanetworks442
chapter15localareanetworkoverview442
15.1topologiesandtransmissionmedia443
15.2lanprotocolarchitecture449
15.3bridges457
15.4hubsandswitches465
15.5virtuallans469
15.6recommendedreadingandwebsites474
15.7keyterms,reviewquestions,andproblems474
chapter16ethernet477
16.1traditionalethernet479
16.2high-speedethernet489
16.3ieee802.1qvlanstandard498
16.4recommendedreadingandwebsites500
16.5keyterms,reviewquestions,andproblems500
appendix16adigitalsignalencodingforlans503
appendix16bscrambling510
chapter17wirelesslans513
17.1overview514
17.2wirelesslantechnology519
17.3ieee802.11architectureandservices521
17.4ieee802.11mediumaccesscontrol526
17.5ieee802.11physicallayer533
17.6recommendedreadingandwebsites541
17.7keyterms,reviewquestions,andproblems542
partfiveinternetandtransportprotocols545
chapter18internetprotocols545
18.1principlesofinternetworking546
18.2internetprotocoloperation551
18.3internetprotocol558
18.4ipv6568
18.5virtualprivatenetworksandipsecurity577
18.6recommendedreadingandwebsites580
18.7keyterms,reviewquestions,andproblems581
chapter19internetworkoperation585
19.1multicasting586
19.2routingprotocols596
19.3mobileip607
19.4recommendedreadingandwebsites619
19.5keyterms,reviewquestions,andproblems620
chapter20internetworkqualityofservice623
20.1integratedservicesarchitecture625
20.2resourcereservationprotocol634
20.3differentiatedservices644
20.4servicelevelagreements652
20.5ipperformancemetrics654
20.6recommendedreadingandwebsites657
20.7keyterms,reviewquestions,andproblems659
chapter21multiprotocollabelswitching661
21.1theroleofmpls663
21.2backgrounds665
21.3mplsoperation667
21.4labels672
21.5fecs,lsps,andlabels676
21.6labeldistribution678
21.7trafficengineering682
21.8virtualprivatenetworks687
21.9recommendedreadingandwebsites689
21.10keyterms,reviewquestions,andproblems690
chapter22transportprotocols692
22.1connection-orientedtransportprotocolmechanisms694
22.2tcp712
22.3tcpcongestioncontrol720
22.4udp731
22.5recommendedreadingandwebsites732
22.6keyterms,reviewquestions,andproblems733
appendices737
appendixafourieranalysis737
a.1fourierseriesrepresentationofperiodicsignals738
a.2fouriertransformrepresentationofaperiodicsignals739
a.3recommendedreading742
appendixbprojectsandotherstudentexercisesforteachingdataandcomputercommunications743
b.1animationsandanimationprojects744
b.2practicalexercises745
b.3socketsprojects745
b.4wiresharkprojects746
b.5simulationandmodelingprojects746
b.6performancemodeling747
b.7researchprojects747
b.8reading/reportassignments748
b.9writingassignments748
b.10discussiontopics748
references749
index762
partsixnetworksecurity(第23章和第24章的文件可登录华信教育资源网（www.hxedu.com.cn）注册下载)
chapter23computerandnetworksecuritythreats
23.1computersecurityconcepts
23.2threats,attacks,andassets
23.3intruders
23.4malicioussoftwareoverview
23.5viruses,worms,andbots
23.6recommendedreadingandwebsites
23.7keyterms,reviewquestions,andproblems
chapter24computerandnetworksecuritytechniques
24.1virtualprivatenetworksandipsec
24.2sslandtls
24.3wi-fiprotectedaccess
24.4intrusiondetection
24.5firewalls
24.6malwaredefense
24.7recommendedreadingandwebsites
24.8keyterms,reviewquestions,andproblems
onlinechapters
partseveninternetapplications25-1
chapter25electronicmail,dns,andhttp25-1
25.1electronicmail:smtpandmime25-2
25.2internetdirectoryservice:dns25-17
25.3webaccessandhttp25-28
25.4recommendedreadingandwebsites25-40
25.5keyterms,reviewquestions,andproblems25-41
chapter26internetmultimediasupport26-1
26.1real-timetraffic26-2
26.2voiceoveripandmultimediasupport—sip26-5
26.3real-timetransportprotocol26-15
26.4recommendedreadingandwebsites26-25
26.5keyterms,reviewquestions,andproblems26-26
onlineappendices
appendixcstandardsorganizations
c.1theimportanceofstandards
c.2standards-settingorganizations
appendixdtheosimodel
d.1themodel
d.2theosilayers
appendixetheinternationalreferencealphabet
appendixfproofofthesamplingtheorem
appendixgphysical-layerinterfacing
g.1v.24/eia-232-f
g.2isdnphysicalinterface
appendixhqueuingeffects
h.1queuingmodels
h.2queuingresults
appendixiatmadaptationlayer
i.1aalservices
i.2aalprotocols
appendixjleakybucketalgorithms
j.1peakcellratealgorithm
j.2sustainablecellratealgorithm
appendixkthespanningtreealgorithm
appendixllanperformanceissues
l.1theeffectofpropagationdelayandtransmissionrate
l.2simpleperformancemodelforcsma/cd
appendixmfibrechannel
m.1fibrechannelelements
m.2fibrechannelprotocolarchitecture
m.3fibrechannelphysicalmediaandtopologies
appendixnorthogonality,correlation,andautocorrelation
n.1correlationandautocorrelation
n.2orthogonalcodes
appendixotcp/ipexample
appendixpthetcp/ipchecksum
p.1onescomplementaddition
p.2useintcpandip
appendixqcryptographicalgorithms
q.1symmetricencryption
q.2public-keycryptography
q.3securehashfunctions
appendixruniformresourcelocators(urls)anduniformresourceidentifiers(uris)
r.1uniformresourcelocator
r.2uniformresourceidentifier
r.3tolearnmore
appendixsaugmentedbackus-naurform
appendixtsockets:aprogrammer’sintroduction
t.1sockets,socketdescriptors,ports,andconnections
t.2theclient/servermodelofcommunication
t.3socketselements
t.4streamanddatagramsockets
t.5run-timeprogramcontrol
t.6remoteexecutionofawindowsconsoleapplication
appendixuframerelay
u.1x.25
u.2framerelay
u.3framerelaycongestioncontrol
u.4problems
appendixvderivationsofequationsandexamples
glossary
chapter0reader’sandinstructor’sguide1
0.1outlineofthebook2
0.2aroadmapforreadersandinstructors3
0.3internetandwebresources5
0.4standards6
partoneoverview8
chapter1datacommunications,datanetworks,andtheinternet8
1.1datacommunicationsandnetworkingfortoday’senterprise9
1.2acommunicationsmodel16
1.3datacommunications19
1.4networks22
1.5theinternet25
1.6anexampleconfiguration30
chapter2protocolarchitecture,tcp/ip,andinternet-basedapplications32
2.1theneedforaprotocolarchitecture33
2.2asimpleprotocolarchitecture34
2.3thetcp/ipprotocolarchitecture38
2.4standardizationwithinaprotocolarchitecture46
2.5traditionalinternet-basedapplications49
2.6multimedia50
2.7recommendedreadingandwebsites53
2.8keyterms,reviewquestions,andproblems54
appendix2athetrivialfiletransferprotocol57
parttwodatacommunications62
chapter3datatransmission62
3.1conceptsandterminology64
3.2analoganddigitaldatatransmission75
3.3transmissionimpairments83
3.4channelcapacity89
3.5recommendedreadingandwebsite93
3.6keyterms,reviewquestions,andproblems94
appendix3adecibelsandsignalstrength97
chapter4transmissionmedia100
4.1guidedtransmissionmedia102
4.2wirelesstransmission116
4.3wirelesspropagation124
4.4line-of-sighttransmission129
4.5recommendedreadingandwebsites133
4.6keyterms,reviewquestions,andproblems134
chapter5signalencodingtechniques138
5.1digitaldata,digitalsignals141
5.2digitaldata,analogsignals151
5.3analogdata,digitalsignals162
5.4analogdata,analogsignals168
5.5recommendedreading175
5.6keyterms,reviewquestions,andproblems175
chapter6digitaldatacommunicationtechniques180
6.1asynchronousandsynchronoustransmission182
6.2typesoferrors186
6.3errordetection186
6.4errorcorrection196
6.5lineconfigurations202
6.6recommendedreading203
6.7keyterms,reviewquestions,andproblems204
chapter7datalinkcontrolprotocols208
7.1flowcontrol210
7.2errorcontrol217
7.3high-leveldatalinkcontrol(hdlc)223
7.4recommendedreading230
7.5keyterms,reviewquestions,andproblems230
appendix7aperformanceissues233
chapter8multiplexing268
8.1frequencydivisionmultiplexing243
8.2synchronoustimedivisionmultiplexing249
8.3statisticaltimedivisionmultiplexing259
8.4asymmetricdigitalsubscriberline266
8.5xdsl298
8.6recommendedreadingandwebsites272
8.7keyterms,reviewquestions,andproblems273
chapter9spreadspectrum276
9.1theconceptofspreadspectrum278
9.2frequency-hoppingspreadspectrum279
9.3directsequencespreadspectrum284
9.4codedivisionmultipleaccess290
9.5recommendedreadingandwebsite294
9.6keyterms,reviewquestions,andproblems294
partthreewideareanetworks298
chapter10circuitswitchingandpacketswitching298
10.1switchedcommunicationsnetworks300
10.2circuit-switchingnetworks302
10.3circuit-switchingconcepts305
10.4softswitcharchitecture309
10.5packet-switchingprinciples310
10.6recommendedreading320
10.7keyterms,reviewquestions,andproblems320
chapter11asynchronoustransfermode323
11.1theroleofatm325
11.2protocolarchitecture326
11.3atmlogicalconnections328
11.4atmcells333
11.5transmissionofatmcells339
11.6atmservicecategories343
11.7recommendedreadingandwebsites346
11.8keyterms,reviewquestions,andproblems347
chapter12routinginswitcheddatanetworks350
12.1routinginpacket-switchingnetworks351
12.2examples:routinginarpanet361
12.3least-costalgorithms367
12.4recommendedreading372
12.5keyterms,reviewquestions,andproblems373
chapter13congestioncontrolindatanetworks377
13.1effectsofcongestion379
13.2congestioncontrol384
13.3trafficmanagement386
13.4congestioncontrolinpacket-switchingnetworks388
13.5atmtrafficmanagement388
13.6atm–gfrtrafficmanagement400
13.7recommendedreading403
13.8keyterms,reviewquestions,andproblems404
chapter14cellularwirelessnetworks407
14.1principlesofcellularnetworks408
14.2first-generationanalog422
14.3second-generationcdma423
14.4third-generationsystems429
14.5fourth-generationsystems433
14.6recommendedreadingandwebsites438
14.7keyterms,reviewquestions,andproblems439
partfourlocalareanetworks442
chapter15localareanetworkoverview442
15.1topologiesandtransmissionmedia443
15.2lanprotocolarchitecture449
15.3bridges457
15.4hubsandswitches465
15.5virtuallans469
15.6recommendedreadingandwebsites474
15.7keyterms,reviewquestions,andproblems474
chapter16ethernet477
16.1traditionalethernet479
16.2high-speedethernet489
16.3ieee802.1qvlanstandard498
16.4recommendedreadingandwebsites500
16.5keyterms,reviewquestions,andproblems500
appendix16adigitalsignalencodingforlans503
appendix16bscrambling510
chapter17wirelesslans513
17.1overview514
17.2wirelesslantechnology519
17.3ieee802.11architectureandservices521
17.4ieee802.11mediumaccesscontrol526
17.5ieee802.11physicallayer533
17.6recommendedreadingandwebsites541
17.7keyterms,reviewquestions,andproblems542
partfiveinternetandtransportprotocols545
chapter18internetprotocols545
18.1principlesofinternetworking546
18.2internetprotocoloperation551
18.3internetprotocol558
18.4ipv6568
18.5virtualprivatenetworksandipsecurity577
18.6recommendedreadingandwebsites580
18.7keyterms,reviewquestions,andproblems581
chapter19internetworkoperation585
19.1multicasting586
19.2routingprotocols596
19.3mobileip607
19.4recommendedreadingandwebsites619
19.5keyterms,reviewquestions,andproblems620
chapter20internetworkqualityofservice623
20.1integratedservicesarchitecture625
20.2resourcereservationprotocol634
20.3differentiatedservices644
20.4servicelevelagreements652
20.5ipperformancemetrics654
20.6recommendedreadingandwebsites657
20.7keyterms,reviewquestions,andproblems659
chapter21multiprotocollabelswitching661
21.1theroleofmpls663
21.2backgrounds665
21.3mplsoperation667
21.4labels672
21.5fecs,lsps,andlabels676
21.6labeldistribution678
21.7trafficengineering682
21.8virtualprivatenetworks687
21.9recommendedreadingandwebsites689
21.10keyterms,reviewquestions,andproblems690
chapter22transportprotocols692
22.1connection-orientedtransportprotocolmechanisms694
22.2tcp712
22.3tcpcongestioncontrol720
22.4udp731
22.5recommendedreadingandwebsites732
22.6keyterms,reviewquestions,andproblems733
appendices737
appendixafourieranalysis737
a.1fourierseriesrepresentationofperiodicsignals738
a.2fouriertransformrepresentationofaperiodicsignals739
a.3recommendedreading742
appendixbprojectsandotherstudentexercisesforteachingdataandcomputercommunications743
b.1animationsandanimationprojects744
b.2practicalexercises745
b.3socketsprojects745
b.4wiresharkprojects746
b.5simulationandmodelingprojects746
b.6performancemodeling747
b.7researchprojects747
b.8reading/reportassignments748
b.9writingassignments748
b.10discussiontopics748
references749
index762
partsixnetworksecurity(第23章和第24章的文件可登录华信教育资源网（www.hxedu.com.cn）注册下载)
chapter23computerandnetworksecuritythreats
23.1computersecurityconcepts
23.2threats,attacks,andassets
23.3intruders
23.4malicioussoftwareoverview
23.5viruses,worms,andbots
23.6recommendedreadingandwebsites
23.7keyterms,reviewquestions,andproblems
chapter24computerandnetworksecuritytechniques
24.1virtualprivatenetworksandipsec
24.2sslandtls
24.3wi-fiprotectedaccess
24.4intrusiondetection
24.5firewalls
24.6malwaredefense
24.7recommendedreadingandwebsites
24.8keyterms,reviewquestions,andproblems
onlinechapters
partseveninternetapplications25-1
chapter25electronicmail,dns,andhttp25-1
25.1electronicmail:smtpandmime25-2
25.2internetdirectoryservice:dns25-17
25.3webaccessandhttp25-28
25.4recommendedreadingandwebsites25-40
25.5keyterms,reviewquestions,andproblems25-41
chapter26internetmultimediasupport26-1
26.1real-timetraffic26-2
26.2voiceoveripandmultimediasupport—sip26-5
26.3real-timetransportprotocol26-15
26.4recommendedreadingandwebsites26-25
26.5keyterms,reviewquestions,andproblems26-26
onlineappendices
appendixcstandardsorganizations
c.1theimportanceofstandards
c.2standards-settingorganizations
appendixdtheosimodel
d.1themodel
d.2theosilayers
appendixetheinternationalreferencealphabet
appendixfproofofthesamplingtheorem
appendixgphysical-layerinterfacing
g.1v.24/eia-232-f
g.2isdnphysicalinterface
appendixhqueuingeffects
h.1queuingmodels
h.2queuingresults
appendixiatmadaptationlayer
i.1aalservices
i.2aalprotocols
appendixjleakybucketalgorithms
j.1peakcellratealgorithm
j.2sustainablecellratealgorithm
appendixkthespanningtreealgorithm
appendixllanperformanceissues
l.1theeffectofpropagationdelayandtransmissionrate
l.2simpleperformancemodelforcsma/cd
appendixmfibrechannel
m.1fibrechannelelements
m.2fibrechannelprotocolarchitecture
m.3fibrechannelphysicalmediaandtopologies
appendixnorthogonality,correlation,andautocorrelation
n.1correlationandautocorrelation
n.2orthogonalcodes
appendixotcp/ipexample
appendixpthetcp/ipchecksum
p.1onescomplementaddition
p.2useintcpandip
appendixqcryptographicalgorithms
q.1symmetricencryption
q.2public-keycryptography
q.3securehashfunctions
appendixruniformresourcelocators(urls)anduniformresourceidentifiers(uris)
r.1uniformresourcelocator
r.2uniformresourceidentifier
r.3tolearnmore
appendixsaugmentedbackus-naurform
appendixtsockets:aprogrammer’sintroduction
t.1sockets,socketdescriptors,ports,andconnections
t.2theclient/servermodelofcommunication
t.3socketselements
t.4streamanddatagramsockets
t.5run-timeprogramcontrol
t.6remoteexecutionofawindowsconsoleapplication
appendixuframerelay
u.1x.25
u.2framerelay
u.3framerelaycongestioncontrol
u.4problems
appendixvderivationsofequationsandexamples
glossary
展开全部
数据与计算机通信-(第九版)-英文版 作者简介
William Stallings:著名计算机专业作家，已出版各计算机本科课程教材十多种，获多项教学奖项。
书友推荐
- >
名家带你读鲁迅:朝花夕拾
名家带你读鲁迅:朝花夕拾
¥10.5¥21.0 - >
烟与镜
烟与镜
¥15.4¥48.0 - >
【精装绘本】画给孩子的中国神话
【精装绘本】画给孩子的中国神话
¥17.6¥55.0 - >
小考拉的故事-套装共3册
小考拉的故事-套装共3册
¥36.7¥68.0 - >
随园食单
随园食单
¥21.6¥48.0 - >
罗曼·罗兰读书随笔-精装
罗曼·罗兰读书随笔-精装
¥17.4¥58.0 - >
诗经-先民的歌唱
诗经-先民的歌唱
¥18.7¥39.8 - >
自卑与超越
自卑与超越
¥13.5¥39.8
本类畅销
-
THE GREAT GATSBY-了不起的盖茨比
¥8.4¥16.8 -
地心游记(纯英文)/床头灯英语.3000词读物
¥9¥15.8 -
呼啸山庄-英语原著版
¥10.7¥18 -
教师-中译经典文库-世界文学名著-第五辑
¥9¥14 -
小妇人(纯英文)/床头灯英语.3000词读物
¥9¥15.8 -
方法论
¥6.3¥9.5
