單項選擇題

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

你可能感興趣的試題

單項選擇題

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

單項選擇題

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