单项选择题
A.TDC B.DTC C.BDC D.BCD
During the suction stroke, the piston is moving （）.A.in...
单项选择题During the suction stroke, the piston is moving （）.
A.inwards B.outwards C.downwards D.upwards
During the inspection, the starting air valves should b...
单项选择题During the inspection, the starting air valves should be closed （） the engine from turning.
A.to increase B.to speed up C.to prevent D.to reduce
During repair,lubrication lines and orifices must be （）...
单项选择题During repair,lubrication lines and orifices must be （）.
A.taken away B.engaged C.connected D.sealed off
