题目内容

用两个反并联晶闸管可以构成电力电子开关。( )

A. 对
B. 错

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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

Which of the following letter or letter group can be pronounced as /k/?

A. c
B. k
C. ck
D. q

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