题目内容

在甲类、乙类和甲乙类功率放大电路中,效率最低的电路为功率放大电路,为了消除交越失真常采用功率放大电路。

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以输出较大功率为目的的放大电路称为功率放大电路。

A. 对
B. 错

严格说,输入信号很小时,达不到三极管的开启电压,三极管不导电。因此在正、负半周交替过零处会出现一些非线性失真,这个失真称为交越失真。

A. 对
B. 错

When does a complaint usually happen?

A. . at the beginning of the travel
B. during the travel
C. after the travel
D. All of them

off-site complaints refer to complaints that tourists may make

A. face to face
B. in the tourist attractions
C. through phone calls or e-mails
D. to directors