多项选择题

光功率异常产生误码的原因，可能是（）

A.VOA调的过大
B.接收光功率高于最小过载点导致误码
C.接收端信噪比下降导致误码
D.接收光功率低于接收灵敏度导致误码

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热门试题

单项选择题

According to the passage, you can respect foreign guests by（）.

A．saying hello to them whenever you meet them
B．accepting and understanding their different cultures
C．sharing happiness and hardship with them
D．helping them get what they hope for

单项选择题

M: I’d like to buy a new bike for my younger brother.W: The children’s department is up on the third floor.Q: What does the man want to buy for his younger broth（）

A．Flowers.
B．A book.
C．A blouse.
D．A bike.