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單項(xiàng)選擇題

Keep compartment （） as the gas given off can be dangerous.

A.well ventilated
B.well clean
C.in good order
D.more room

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單項(xiàng)選擇題

It is well known that good lubrication will （） the bearings from becoming overheated.

A.present
B.prevent
C.avoid
D.provide

單項(xiàng)選擇題

It is very necessary that each cylinder （） before the charged air is compressed.

A.is scavenged
B.has been scavenged
C.be scavenged
D.was scavenged