单项选择题
In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.
A.pressure charged B.naturally aspirated C.contaminated D.high speed diesel
单项选择题 If there is water in fuel oil, the revolution of the engine will （）.
单项选择题 If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.
单项选择题 If the needle valve in a fuel injection nozzle sticks open （）.
