单项选择题
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
A.oil spray B.oil bath C.oil control rings D.drilled passage through the camshaft
单项选择题 In a four-stroke/cycle diesel engine, the camshaft rotates at （）
单项选择题 A restricted air intake to a diesel engine may result in the engine （）.
单项选择题 Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
