单项选择题
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
The defective places in the furnace （） with fire bricks...
单项选择题The defective places in the furnace （） with fire bricks.
A.should be paved B.should be cleaned C.should be dismantled D.should be welded
