单项选择题
For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.
A.it has a longer power stroke B.more air gets into the cylinder each stroke C.it develops twice as many power strokes at the same speed D.higher combustion pressure is developed
单项选择题 Lube oil cannot be efficiently filtered if its （）.
单项选择题 In using reduction gears to obtain efficient propeller speeds, （）.
单项选择题 Combustion knock occurring in a diesel engine can be caused by （）.
