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【多选题】
下列属于同一时期指标值对比的相对指标有（ ）。A.
结构相对数
B.
比较相对数
C.
比例相对数
D.
强度相对数
E.
计划完成程度相对数
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举一反三
【简答题】按工作原理低压电器分为( )、 ( )。
【单选题】What did the man think he had given to the woman?
A.
An information card of a restaurant.
B.
His own business card.
C.
Mr. Cooper's business card.
D.
A note of what to do.
【简答题】空压机按工作原理可以分为（）、（）。
【单选题】Why didn't he eat anything?
A.
He had forgotten to bring any food with him.
B.
He was afraid he would fall asleep if he should eat anything.
C.
He was not hungry.
D.
It was difficult to eat while flying a plane.
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