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


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2.單項(xiàng)選擇題()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