题目内容

电力电子开关有哪些优点？（）

A. 响应速度快
B. 无触点
C. 寿命长
D. 可频繁控制

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用两个反并联晶闸管可以构成电力电子开关。（）

A. 对
B. 错

Listening：checkingSound discrimination: Listen to the tape and circle the word you hear from the following pairs.

A. pat
B. bat

Listening：checkingSound discrimination: Listen to the tape and circle the word you hear from the following pairs.

A. pond
B. bond

Listening：checkingSound discrimination: Listen to the tape and circle the word you hear from the following pairs.

A. pie
B. buy