单项选择题
A.excessive water in the bilges B.a clogged suction strainer C.oil in the bilges D.All of the above
The shaft and spare parts（） should be well greased in o...
单项选择题The shaft and spare parts（） should be well greased in order to avoid corrosion.
A.in the store room B.in the cylinder C.in the scavenge air box D.in the water box
Water level controllers of the boiler must be kept oper...
单项选择题Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.
A.carry off B.carry down C.carry on D.carry over
The （） of the gravity disc is too big It causes oil to ...
单项选择题The （） of the gravity disc is too big It causes oil to flow through the water outletWe changed the disc and no oil is found in the water outlet.
A.gravity B.diameter C.circumference D.cylinder
