题目内容

交流调功器控制方式有_和_。

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交流调功器利用晶闸管的___________实现交流功率的调节。

a lot of rain in out hometown in summer.

A. There is
B. There has
C. We have
D. We has

There is going to a class meeting this afternoon.

A. have
B. hold
C. is
D. be

There a lot of traffic at this time of day. so you'd better careful.

A. has, be
B. have,been
C. is, be
D. are, be