單項(xiàng)選擇題

A disadvantage of a two-stroke/cycle diesel engine is（）

A.more power strokes per revolution
B.the use of scavenge air
C.more complicated valve gear
D.higher working temperature of the piston and cylinder

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單項(xiàng)選擇題

Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）

A.less even torque
B.higher cylinder head temperatures
C.fewer power strokes per revolution
D.greater weight/size requirements

單項(xiàng)選擇題

A disadvantage of a four-stroke/cycle diesel engine is （）

A.higher working temperature of piston and cylinder
B.the use of scavenge ports
C.fewer power strokes per revolution of the crankshaft
D.part of the fuel is burned as the piston is moving away from top dead center