单项选择题
A.land B.skirt C.crown D.plate
The diesel engine valve subjected to most severe condit...
单项选择题The diesel engine valve subjected to most severe conditions of service is the （）.
A.cylinder exhaust valve B.air starting valve C.air inlet valve D.cylinder relief valve
A piston in a four-stroke/cycle diesel engine makes fou...
单项选择题A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.
A.crankshaft revolution B.mechanical cycle of operation C.period of two combustion cycles D.cycle of two events
The effective stroke of a constant-stroke, individual, ...
单项选择题The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the （）.
A.control rack B.delivery valve C.governor speed D.plunger crossbar
