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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单项选择题

A.six consecutive starts
B.eight consecutive starts
C.ten consecutive starts
D.twelve consecutive starts

单项选择题

A.cylinder heads
B.exhaust valves
C.scavenging air
D.injectors

单项选择题

A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motors