单项选择题

Camshafts are usually driven by timing gears or （）.

A.push rods
B.chain drives
C.rocker arms
D.flywheels

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单项选择题
A waste heat boiler is installed on some diesel propelled vessels to （）.

A.provide steam for emergency propulsion
B.provide steam for the turbo-generator
C.heat the waste water tanks
D.steam for warming engines
单项选择题
What is the speed of the crankshaft in a four-stroke cycle engine when the camshaft is turning at 750 rpm?（）

A.375 RPM
B.500 RPM
C.750 RPM
D.1500 RPM
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