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單項選擇題

It is necessary to remove （） from the cooling spaces.

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

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單項選擇題

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

單項選擇題

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

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