单项选择题
A.0.02-0.03mm B.0.03-0.04mm C.0.04-0.05mm D.0.05-0.06mm
A.早开早闭 B.早开晚闭 C.晚开早闭 D.晚开晚闭
A.气门早开早闭 B.气门晚开早闭 C.气门晚开晚闭 D.配气机构改变
A.5-15mm B.10-20mm C.15-25mm D.25-30mm
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