单项选择题
The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
A.causes colloid suspension in the cooling water B.reduces the capability of the lubrication system C.can form pockets which block the flow of coolant through the system D.leads to the scuffing of cylinder walls
单项选择题 The engine in a covered lifeboat is fueled with（）.
单项选择题 Sudden unloading of a diesel engine can cause（）.
单项选择题 Storage batteries on T-Boats must be located（）.
