单项选择题
Cooling the intake air supplied to a diesel engine will （）.
A.reduce mean effective pressure B.decrease average compression pressure C.decrease air charge density D.increase power output
单项选择题 Excessive vibration of an automatically fired auxiliary boiler can be caused by （）
单项选择题 When there is a flame failure in an automatically fired auxiliary boiler, the （）.
单项选择题 If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
