单项选择题
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
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
