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
单项选择题 Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
单项选择题 A disadvantage of a four-stroke/cycle diesel engine is （）
单项选择题 The cubic inch(or liter) displacement of a cylinder is determined by the diameter of the piston and the （）
