Diesel engine valve springs function to （）<br>A:hold the valves open<br>B:keep the valves off their seats until the exhaust stroke is completed<br>C:close the valves<br>D:open inlet valves when the air injection cycle begins

Diesel engine valve springs function to （）
A:hold the valves open
B:keep the valves off their seats until the exhaust stroke is completed
C:close the valves
D:open inlet valves when the air injection cycle begins

出自：海船船员证

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