题目内容

在下列网间连接器中,()在数据连路层实现网络互连。A.中继器 B.网桥 C.路由器 D.网关

A
B
C
D

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承载信息量的基本信号单位是()。A.码元 B.比特 C.数据传输速率D.误码率

A
B
C
D

There were fifty- two persons present, counting __________ the babies.

A. over
B. with
C. to
D. in

Every year we give ________ 200 million pounds of clothing away to the African Country.

A. over
B. off
C. in
D. up

You can donate directly ______ a charity or run a charity event.

A. for
B. to
C. in
D. on

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