單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

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

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