单项选择题
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
The designed （） is 20 tons per day, but the fresh water...
单项选择题The designed （） is 20 tons per day, but the fresh water generator can only distil 15 tons at present.
A.displacement B.weight C.power D.capacity
