- 形滑閥
- d: CD = 400. DC = 600.
- slidevalve: 滑閥
- 'd: 〔口語(yǔ)〕 1.= had: I'd ... = I had .... 2.= did: Where'd ... = Where did .... 3.= should (或 would): He'd ... = He should (或 would). 4.=-ed: foster'd.
- a and d: 入院和出院
- a d: disk]重折光盤(pán); 放棄的; 是一組對(duì)立項(xiàng); 重折光盤(pán),暗帶
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