单选题Diesel engine valve springs function to （）Ahold the valves openBkeep the valves off their seats until the exhaust stroke is completedCclose the valvesDopen inlet valves when the air injection cycle begins
单选题
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
参考解析
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