单项选择题
Turbulence is created in the cylinders of a diesel engine to （）
A.obtain injection lag B.help mix fuel and air C.increase combustion pressure D.utilize higher injection pressures
单项选择题 The ratio of the brake horsepower to the indicate of a diesel engine is its （）
单项选择题 In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）
单项选择题 An over-speed trip stops a diesel engine when the engine （）
