單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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