单项选择题
On what do you depend having the air cooler of main engine chemically washed?（）
A.increased air pressure differenced before and aft air cooler
B.reduced exhaust temperature in all cylinders
C.reduced temperature difference between water inlet and outlet
D.both A and C
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相关考题
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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 -
单项选择题
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
C.less internal corrosion because of lower brine density
D.less feed-water is required for equal plant capacity
