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單項(xiàng)選擇題

The machine has stopped rotating because the bearing （） the shaft.

A.seized
B.clogged
C.melted
D.inserted

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單項(xiàng)選擇題

The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.

A.sufficient quantity； measured
B.measured quantity；sufficient
C.excessive quantity；sufficient
D.the less quantity the better；the more the better

單項(xiàng)選擇題

The lubricating pipes and dusts should be blown out with （）.

A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds

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