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【简答题】
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参考答案:
举一反三
【单选题】速率155.520Mbit/s是( )系统的标准速率等级之一。
A.
SDH
B.
PDH
C.
PCM
D.
STM-1
【简答题】STM-1的速率是_______Mbit/s。
【判断题】STM-1的正常速率是51.840Mbit/s。
A.
正确
B.
错误
【单选题】----Don't forget to ask him to write to me. ----I won't. As soon as he ____, I'll ask him to write to you.
A.
will come
B.
came
C.
comes
D.
will coming
【单选题】--- Don’t forget to ask him to write to me. --- I won’t. As soon as he _______, I’ll ask him to write to you.
A.
 will come
B.
came
C.
comes
D.
is coming
【单选题】--- Don’t forget to ask him to write to me. --- I won’t. As soon as he __ ______ _____, I’ll ask him to write to you. A. will come B. came C. comes D. is coming
A.
1
B.
2
C.
3
D.
4
【单选题】欲除去氯气中少量的氯化氢气体,可选用的试剂是
A.
氢氧化钠溶液
B.
硝酸银溶液
C.
饱和食盐水
D.
饱和碳酸钠溶液
【单选题】欲除去氯气中少量的氯化氢气体,可选用的试剂是
A.
饱和碳酸钠溶液
B.
硝酸银溶液
C.
氢氧化钠溶液
D.
饱和食盐水
【单选题】STM-1的速率是()。
A.
155.520Mbit/s
B.
2048kbit/s
C.
622.520Mbit/s
D.
655.52Mbit/s
【判断题】SDH的基本速率是155.52Mbit/s,称为STM-1,更高的速率是STM-1的N倍,表示为STM-N。
A.
正确
B.
错误
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