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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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

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