單項(xiàng)選擇題

Fuel oil is regularly transferred to the day tank in order to （）

A.allow impurities to settle out of the fuel
B.allow air to escape from the fuel
C.make fuel available for immediate use
D.all of the above

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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