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【多选题】
关于进气提前角,下列哪些说法正确?
A.
它是指进气门打开的角度
B.
它是指从进气门开始开启到上止点所对应的曲轴转角
C.
它是指从进气门开始开启到下止点所对应的曲轴转角
D.
进气门开始开启时,活塞处于排气行程末期
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