根据材料回答16~17题:T1载波把24条信道按 (16) 方式复用在一条1.544Mbps的高速信道上,每条话音信道的有效数据传输速率是 (17) 。
A.波分多路
B.时分多路
C.空分多路
D.频分多路
A.波分多路
B.时分多路
C.空分多路
D.频分多路
根据下列材料请回答 16~30 题:
Some years ago,Chinese high school students would show their new schoolbags,new clothes or new pens to their classmates when the new term started.Today,however,all have 16 If you still come back to school 17 0nly these things,you are out—of-date(过时的)。Students in big cities like to bring the latest high.tech things to school,and feel happy and 18 to show off(炫耀)these things to 19 .Mobile phones,MP3 players,CD players,electronic dictionaries,the list is endless.
Young people think that.1iving in the 21 st century,they must keep up with the 20 They don't want to fall 21 .Besides,they think 22 they need to keep in touch with their classmates.SO they need mobile phones.They also like to 23 the pop music,SO they need CD players.They explain that, 24 like electronic dictionarjes,these can be 25 in their study, 26 .They think that their parents should understand 27 they want these things-
Foreign students will also bring some latest high-tech things when they 28 to school at the beginning of a new term. 29 ,they often use the money which they made by themselves during the holiday to 30 these high—tech things that they want.
第 16 题
A.changed
B.come
C.joined
D.stopped
T1载波每个信道的数据速率为(16),T1信道的总数据速率为(17)。
A.32Kb/s
B.56Kb/s
C.64Kb/s
D.96Kb/s
● T1 载波每个信道的数据速率为 (16) ,T1 信道的总数据速率为 (17) 。
(16)
A. 32Kb/s
B. 56Kb/s
C. 64Kb/s
D. 96Kb/s
(17)
A. 1.544Mb/s
B. 6.312Mb/s
C. 2.048Mb/s
D. 4.096Mb/s
A.32%
B.16%
C.8%
D.24%
A.知识
B.领悟
C.相似
D.词汇
根据材料回答17~18题: 面向对象中的(17)机制是对现实世界中遗传现象的模拟。通过该机制,基类的属性和方法被遗传给派生类;而(18)是指把数据以及操作数据的相关方法组合在同一单元中,使我们可以把类作为软件复用中的基本单元,提高内聚度,降低耦合度。 A.复用 B.消息 C.继承 D.变异
A.0
B. 2 890
C. 17 000
D. 19 890
(21)
A. 时分多路
B. 频分多路
C. 空分多路
D. 码分多址
(22)
A. 16
B. 24
C. 59
D. 124
(23)
A. 50
B. 1000
C. 8000
D. 10000
根据所听材料,回答 15~17 题
第 15 题 In the United States, the most popular months for weddings are __________.
[A] in June and July [B] in July and August
[C] from June to August
[D] from July to September
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