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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

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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

單項(xiàng)選擇題

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

A.is scavenged
B.is atomized with fuel oil
C.be scavenged
D.be atomized with fuel oil

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