皮皮学，免费搜题
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【单选题】
发动机中等转速时，进排气门早开迟闭的大小最为合适，进排气门开启时间较长，进气阻力不大，能做到（）。
A.
减少排气，增加压缩比
B.
进气充足，排气彻底
C.
增加进气，提高充气系数
D.
减少排气，节约燃料
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