单项选择题
Most fuel injection nozzles are opened by （）.
A.fuel oil pressure
B.a cam operated follower
C.a spring-loaded pressure plate
D.timing gears keyed to the crankshaft
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A.six consecutive starts
B.eight consecutive starts
C.ten consecutive starts
D.twelve consecutive starts -
单项选择题
A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
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单项选择题
Lube oil pumps taking suction from the sump of most small marine engines are usually （）.
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B.of the centrifugal type
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