2022船舶动力装置题库试题答案+专家解析(04.19)

1. [单选题]For an ordinary four-stroke diesel engine the exhaust valves close （）.

A. after TDC
B. before TDC
C. after BDC
D. before BDC

2. [单选题]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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