单项选择题

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
D.consult/sufficient

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单项选择题

When we say that two objects have relative motion, we mean （）.

A.the distance between them remains the same
B.the distance between them is changing
C.the position between them is not changing
D.their positions to the earth remain the same

单项选择题

The trouble-free life of an engine indicates （）.

A.the period of time during which no trouble occurs to the engine
B.no trouble will occur to the engine all its life
C.trouble may occur freely to the engine
D.no matter what you do to the engine, no trouble will occur during this period

单项选择题

General, the best way for replacement of lamp is （）.

A.after the point is reached at which the failures begin to increase rapidly
B.before the point is reached at which the failures begin to increase rapidly
C.before the point is reached at which the failures begin to increase slowly
D.after the point is reached at which the failures begin to increase slowly