题目内容

STM-4的帧周期为4×125μs。

A. 对
B. 错

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对于任何级别的STM-N帧,帧频是8000帧/秒,也就是帧周期为恒定的125μs。

A. 对
B. 错

Beijing is _____ capital of _____ People's Republic of ______ China.

A. a,the,the
B. the,the,/
C. the,the,the

______ honest boy is Jim, ______ friend of mine.

A. The, a
B. The, the
C. An, the

Children usually go to school _____ at ____age of seven.

A. /, the
B. the, the
C. /, /

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