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單項(xiàng)選擇題

Adequate attention must be given to the water cooling system of the air compressors, for （） can cause condensation on the cylinder walls.

A.overcooling
B.poor cooling
C.overloading
D.unloading

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單項(xiàng)選擇題

Bad valves operation of the reciprocating air compressors can be detected by observation of （）.

A.the discharge temperature low
B.the discharge temperature high
C.the discharge pressure rise
D.the inter-stage pressure low

單項(xiàng)選擇題

By far the greatest item of maintenance of the reciprocating air compressors concerns （）.

A.the lubrication
B.the cooling
C.the moisture separation
D.the valves