单项选择题
Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.
A.controller B.governor C.instrument D.apparatus
单项选择题 Fuel injected into a diesel engines cylinder is ignited by （）.
单项选择题 Fuel has been injected but ignition fails The possible cause may be （）.
单项选择题 Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
