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| 二冲程发动机/转子发动机气口开闭正时; 气口开闭时刻调节; 四行程发动机配气气门正时指气门开或闭的相应曲轴角度; 連接埠類型時序 | |||
| 进排气孔口开闭时刻图; 汽门定时 | |||
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port timing : 3 phrases in 1 subject |
| Automobiles | 3 |
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