问题描述：
[单选]
The process to remove exhaust gases by blowing in fresh air is called（）．
A．charging
B．supercharging
C．starting
D．scavenging
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答案解析：无
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上一篇：The projection on a shaft designed to change circular motion into up and down or back and fore motion is called（）．
下一篇：The process of loop scavenge is that the exhaust will be via ports（）the air ports and controlled by the same piston．
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