单项选择题

The rotating range of the low speed diesel engine is usually lower than （）.

A.100 rpm
B.200 rpm
C.300 rpm
D.500 rpm

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Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.

A.read/sufficient
B.consult/sufficiently
C.read/sufficiently
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When we say that two objects have relative motion, we mean （）.

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