单选题The exhaust ports are located around the lower part of the cylinder liner, （）the products of combustion are driven by scavenging air.Ain whichBby whichCthrough whichDfrom which
单选题
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
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