多项选择题

逆变器基本电路结构包括
A、输入电路
B、主逆变电路
C、控制电路
D、输出电路

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单项选择题

无梁板系指不带梁直接用柱头支承的板，其体积按（）计算。
A、板
B、板+柱帽
C、柱帽
D、柱

单项选择题

In order to go to university, secondary school students must meet the following requirements EXCEPT that_____. A.
they have high School records and recommendations from their teachers B.
they make good impressions during the interviews C.
they get good scores in the Scholastic Assessment Tests D.
they pass the college entrance examinations