_______, she went back to her room.
A. There was no cause for alarm
Being no cause for alarm
C. There being no cause for alarm
D. Without having no cause for alarm
查看答案
There are four factories in our institute, ____________.
A. with each has over 100 workers
B. each having over 100 workers
C. which there are over 100 workers
D. with having over 100 workers
72. He left the room____.
A. with the door closing
B. with the door closed
C. with the door being closed
D. with the door being closed
在没有泄露的情况下，泵在单位时间内所输出的油液体积称为（ ）
A. 理论流量
B. 实际流量
C. 最小流量
D. 排量
泵的实际流量和理论流量之比称之为（）
A. 容积效率
B. 机械效率
C. 总效率
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