单项选择题
Starting air valves are held firmly on their seats by（）
A.cam rollers on the camshaft
B.spring force
C.air pressure on top of the valve differential piston
D.air pressure on the bottom of the valve differential piston
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The depth of fuel oil in a tank is normally measured through the（）
A.vent line
B.overflow line
C.feed line
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单项选择题
Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）
A.Holding the valve open for a long period
B.Increasing the starting air pressure used
C.Opening the stating air valve quickly
D.Reducing the starting air valve size -
单项选择题
Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）
A.corrosion fretting
B.insufficient lubrication
C.abnormal wear
D.fatigue failure
