单项选择题

When entering a foam injected space （） breathing apparatus.

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

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单项选择题

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

单项选择题

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

单项选择题

（）during the last repair?

A.Did you have No.4 cylinder repair
B.Do you have No.4 cylinder repaired
C.Didn’t you have No.4 cylinder repairing
D.Didn’t you have No.4 cylinder repaired