单选题The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.Athe scavenging airBthe exhaust gasesCthe mixed airDthe spray oil
单选题
The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.
A
the scavenging air
B
the exhaust gases
C
the mixed air
D
the spray oil
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