The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.<br>A:the scavenging air<br>B:the exhaust gases<br>C:the mixed air<br>D:the spray oil

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

出自：海船船员证

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