单项选择题
A.fuel valve B.lubricator C.indicator valve D.the starting valve
The cylinder contains a great weight of air and is capa...
单项选择题The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.
A.the beginning of the compression stroke B.the beginning of the suction stroke C.the end of the working stroke D.the end of the exhaust stroke
The cylinder and piston must be warmed up （） to a tempe...
单项选择题The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.
A.repeatedly B.quickly C.gradually D.immediately
The crown is fairly thick with the cylindrical parts （）...
单项选择题The crown is fairly thick with the cylindrical parts （） to a thinner section.
A.forged B.tapering C.drilling D.boring
