单项选择题
A.the low inertia B.the high inertia C.the low velocity D.the high velocity
A （） in the air delivery line near to each compressor i...
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
Adequate attention must be given to the water cooling s...
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
Bad valves operation of the reciprocating air compresso...
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
