单项选择题
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
After fitting back in place the gear wheels, don’t forg...
单项选择题After fitting back in place the gear wheels, don’t forget to （） them.
A.fulfill B.eliminate C.grease D.bend
