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问题 单项选择题

SDH自愈网中，某4节点STM-1自愈环采用2纤单向通道倒换保护方式，则环上可能的最大业务容量为（）。

A.63个VC4

B.126个VC4

C.252个VC4

答案

参考答案：A

听力题

小题1:There are two people w          ________ for the bus.

小题2:How do you get a         _______with your classmates?

小题3:Look! It’s raining outside, you’d better take an u_________.

小题4: Who m___________ dinner for your family? My mother does.

小题5: Could I b_______________ your new bike?   Sure.

小题6:You should a______________ some water to the soup.

小题7:Paul is never q______________, he can’t stop talking.

小题8:First I have to p______________ my English.

小题9:Miss White is looking t         _____books in the library.

小题10:There are two basketball m__________ of Yao Ming.
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单项选择题

（）应具有良好的锚设备，便于船队锚泊和加强船队的制动能力

A.首排驳船

B.边驳

C.顶驳

D.尾排驳船
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