单项选择题
In a four stroke engine, which process lasts the longest period?（）
A.exhaust and suction process
B.suction and compression process
C.combustion and exhaust process
D.working and exhaust process
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In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）
A.compression stroke
B.suction stroke
C.expansion stroke
D.exhaust stroke -
单项选择题
One advantage of a flash distilling plant when compared to a submerged tube distiller is（）
A.greater distillate purity through high temperature evaporation
B.cold shocking for scale removal is not required
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单项选择题
Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）
A.refrigerant bubbles in the lube oil
B.refrigerant reducing the lube oil viscosity
C.oxidation of the lube oil from overheating
D.reducing the floc or cloud point of the oil
