單項(xiàng)選擇題

A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity

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單項(xiàng)選擇題

A （） in the air delivery line near to each compressor is essential.

A.butterfly valve
B.globe valve
C.gate valve
D.non-return valve

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