单项选择题
A.put out B.put on C.take off D.take in
The exhaust ports are located around the lower part of ...
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
The main engine is cooled with fresh water （）is added s...
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
（）during the last repair?A.Did you have No.4 cylinder r...
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
