单项选择题
A.gas composition B.gas temperature C.pressure D.timing
Camshafts are usually driven by timing gears or （）.A.pu...
单项选择题Camshafts are usually driven by timing gears or （）.
A.push rods B.chain drives C.rocker arms D.flywheels
A waste heat boiler is installed on some diesel propell...
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
What is the speed of the crankshaft in a four-stroke/cy...
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
