题目内容

物理线路的噪声包括以下两类()

A. 热噪声
B. 冷噪声
C. 打击噪声
D. 冲击噪声

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更多问题

0比特插入/删除法中规定,发送端在两个标志字段间的比特序列,如果检查出连续的()个数字1,就增加1个0比特。

A. 4
B. 5
C. 6
D. 7

PPP协议帧头的标志字段填入的值是()

A. 0111110
B. 01111110
C. 011111110
D. 11111100

It rained heavily, severe flooding in the area.

A. cause
B. caused
C. causing
D. having caused

They stood there for half an hour,the stars in the sky.

A. watch
B. watched
C. were watching
D. watching

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