單項選擇題

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

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單項選擇題

With （）, the corrosion problems are much reduced in a central cooling system.

A.no equipment in contact with sea water
B.less equipment in contact with fresh water
C.more equipment in contact with sea water
D.less equipment in contact with sea water

單項選擇題

You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.

A.the temperature
B.the rust
C.the pressure
D.the humidity