题目内容

President Xi smiled and gave each of them a hearty.

A. handshake
B. shake hands
C. shake hand
D. handshakes

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Judy spoke in a loud, rathervoice.

A. friendly
B. unfriendly
C. formal
D. informal

She arrived at the airport on time and greeted her mother a hug.

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

晶体管在放大状态时，其电压偏置条件为。

A. 集电结正向偏置、发射结正向偏置
B. 集电结正向偏置、发射结反向偏置
C. 集电结反向偏置、发射结反向偏置
D. 集电结反向偏置、发射结正向偏置

对于固定偏置放大电路，随着温度升高，容易使放大电路出现（）。

A. 截止失真
B. 饱和失真
C. 频率失真
D. 交越失真