单项选择题
A.In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater
B.Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports
C.No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine
D.The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
单项选择题 If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）
单项选择题 A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）
单项选择题 If the turbocharger of a four-stroke/cycle diesel engine fails to operate, which of the following statements best describes the probable effect?（）