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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It is very important that each cylinder should be （） scavenged before the charged air is compressed.

A.well
B.good
C.excellent
D.respectively

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It is necessary to remove （） from the cooling water spaces to improve heat transfer.

A.lime
B.frost
C.scale
D.scar

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