题目内容

There a tallk about American Country music in our school tonight.

A. will have
B. is going to have
C. have
D. will be

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There many trees here two years ago.

A. was
B. is
C. are
D. were

The radio says a cold day in south China tomorrow?

A. will be
B. will have
C. will get
D. there will be

双向晶闸管伏安特性曲线的正向部分位于第象限，反向部分位于第象限。

A. Ⅰ；Ⅱ
B. Ⅰ； Ⅲ
C. Ⅳ；Ⅱ
D. Ⅳ；Ⅲ

一个200A的双向晶闸管与两个反并联___________A的普通晶闸管电流容量相等。