单项选择题
A.later and close sooner B.sooner and close later C.sooner and close sooner D.later and close later
Pyrometers commonly found on diesel engine exhaust syst...
单项选择题Pyrometers commonly found on diesel engine exhaust systems, consist of（）
A.pyrostats and a voltmeter B.a gas-filled bellows, a tube and a pressure gauge C.thermocouples and a voltmeter D.ammeters and thermocouples
Low compression in a diesel engine can be caused by （）A...
单项选择题Low compression in a diesel engine can be caused by （）
A.clogged coolant passages B.a leaking cylinder head gasket C.low fuel oil pressure D.worn or broken cylinder liner sealing rings
In a four-stroke cycle diesel engine the intake valves ...
单项选择题In a four-stroke cycle diesel engine the intake valves open （）
A.before TDC and close after BDC B.after TDC and close after BDC C.before TDC and close before BDC D.after TDC and close before BDC
