单项选择题
In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）
A.noise coming from that air starting valve B.continuous operation of the starting air compressor C.zero air pressure in the air starting system D.overheated starting air pipe to the cylinder head
单项选择题 An over-speed trip serves to （）
单项选择题 Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）
单项选择题 In describing basic diesel engine operation，the term ‘event’ refers to （）
