二冲程柴油机气阀与气口或气口与气口重叠开启角是指：-查字典考试网

二冲程柴油机气阀与气口或气口与气口重叠开启角是指：

A、下止点前后，进气口与排气阀或进气口与排气口同时开启的凸轮转角
B、上止点前后，进气口与排气阀或进气口与排气口同时开启的凸轮转角
C、下止点前后，进气口与排气阀或进气口与排气口同时开启的曲轴转角
D、上止点前后，进气口与排气阀或进气口与排气口同时开启的曲轴转角

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