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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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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