题目内容

二冲程横流扫气式柴油机的进、排气口正时有________。

A. 扫气口先开,排气口后开,扫气口先关,排气口后关
B. 扫、排气口同时启闭
C. 排气口先开,扫气口后开,排气口先关,扫气口后关
D. 排气口先开,扫气口后开,扫气口先关,排气口后关

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