单项选择题
The depth of fuel oil in a tank is normally measured through the（）
A.vent line
B.overflow line
C.feed line
D.sounding tube
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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 -
单项选择题
Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）
A.sludge
B.water
C.micro-organism growth
D.all of the above
