单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

The cubic inch(or liter) displacement of a cylinder is determined by the diameter of the piston and the （）

A.length of the crankshaft
B.volume of the clearance space
C.weight of piston
D.length of the stroke