轮机英语【二三管】题库

单选题 1分

As the inlet ports are opened by the downward moving piston, the scavenging air enters and displaces...

As the inlet ports are opened by the downward moving piston, the scavenging air enters and displaces the remaining exhaust gas in preparation for _____
  • A.burning
  • B.the next cycle
  • C.the combustion
  • D.the infection
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轮机英语【二三管】-题库

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