平屋顶的构造层次一般由（）A、防水层（面层） B、卷材层 C、

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问题多项选择题

平屋顶的构造层次一般由（）

A、防水层（面层）

B、卷材层

C、保温隔热层

D、结构层

E、顶棚层

答案

参考答案：A, C, D, E

选择题

So desperate _______ that no one could help another, each ________ to save himself and his animals.

A．was the situation; was trying

B．the situation was; trying

C．was the situation; trying

D．the situation was; was trying

单项选择题

“晶闸管”的专业英语是（）.

A、LED

B、SCR

C、UPS

D、VELOCITY