單項(xiàng)選擇題

When entering a foam injected space （） breathing apparatus.

A.put out
B.put on
C.take off
D.take in

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The exhaust ports are located around the lower part of the cylinder liner, （）the products of combustion are driven by scavenging air.

A.in which
B.by which
C.through which
D.from which

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The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.

A.in which
B.on which
C.to which
D.by which