单项选择题
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
Starting air valves are held firmly on their seats by（）...
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
The depth of fuel oil in a tank is normally measured th...
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
Which of the following methods is used to prevent throt...
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
