There were two _____ people at yesterday_爱下问搜题

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问题选择题

There were two _____ people at yesterday's meeting.

A. hundreds
B. hundreds of
C. hundred
D. hundred of

答案

答案：C

多项选择题

ON网络是以点到多点为特征的单纤双向无源光网络，它包括三个组件：（）

A.OLT

B.ONU

C.BAM

D.ODN

单项选择题

催挂音是（）连续式采用五级响度逐级上升的信号音，用于催请用户挂机。

A.450Hz

B.25Hz

C.950Hz

D.50Hz