题目内容

There are no buses, ______you'll have to walk.

A. so
B. or
C. but
D. for

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Amy is ______. She often helps old people cross the road.

A. careful
B. helpful
C. hard-working
D. sporty

测距方法有( ).

A. 扩频法
B. 带外法
C. 动态法
D. 带内法

APON双向通信可用两条光纤,采用波长(_)

A. 850nm
B. 1310nm
C. 1490nm
D. 1550nm

APON系统，上行传输采用（）接入方式。

A. TDMA
B. CDMA
C. SDMA
D. FDMA