单项选择题
The part of a windlass which physically engages the chain during hauling or paying out is the（）.
A.devil's claw B.bull gear C.wildcat D.cat head
单项选择题 The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
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（）.
