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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3.單項(xiàng)選擇題It is necessary to remove () from the cooling spaces.

A.scar
B.scale
C.spur
D.bilge

4.單項(xiàng)選擇題It is necessary to () cool the various components of the machinery so that the engine can work properly.

A.continuously
B.regularly
C.constantly
D.period

5.單項(xiàng)選擇題It is necessary for us () after having served for a certain period.

A.to change the lube oil
B.have the lube oil purified
C.have the lube oil burnt
D.to analyze the lube oil