短語詞組短語drain cut off current 漏極截止電流drain n off 漸漸枯竭;流掉drain -off system [環(huán)境]排放系統(tǒng)normal operating condensate drain -off connections 經(jīng)常疏水裝置warming -up condensate drain-off connections 啟動(dòng)疏水裝置mercury drain off 泄出水銀drain off detail 漸漸枯竭water drain off control 排水控制 返回 drain off