单项选择题
Fuel has been injected but ignition fails The possible cause may be （）.
A.leaky exhaust valve
B.increased scavenging air temperature
C.engine cylinders not scavenged sufficiently
D.water in the fuel oil
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单项选择题
Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
A.cylinder covers
B.lubricating space
C.crosshead
D.exhaust manifold -
单项选择题
Four strokes consist of suction, compression, （） and exhaust stroke.
A.combustion
B.condensation
C.charging
D.evaporation -
单项选择题
For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.
A.the cylinder cover
B.the bottom of bed-plate
C.the sump
D.the crankcase door
