單項(xiàng)選擇題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


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4.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

5.單項(xiàng)選擇題After fitting back in place the gear wheels, don’t forget to () them.

A.fulfill
B.eliminate
C.grease
D.bend