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单选题
Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.
A
specific volume
B
density
C
viscosity
D
calorific value
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单选题Great care is dedicated to the removal of from the scavenge air（）A
gravityB
viscosityC
densityD
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单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）A
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考题
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单选题Low cylinder compression pressure and a high exhaust temperature may indicate （）A
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starting valvesC
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单选题Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）A
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考题
单选题The shaft and spare parts（） should be well greased in order to avoid corrosion.A
in the store roomB
in the cylinderC
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in the water box
考题
单选题When occurring a fire in the scavenge air box, the following measures should be taken except for（）A
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stopping the fuel oil supplyC
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