短語詞組短語increasing failure rate average class 失效率平均遞增類decreasing failure rate average class 失效率平均遞減類increasing failure rate class 失效率遞增類decreasing failure rate class 失效率遞減類rate of first class 上等煙率tax rate and tax class 稅率稅級base rate for job class 職務工資標準;翻譯first -rate goods-class goods 重品class rate 分級運費率;等級費率;等級貨物運價;貨物的等級運價 返回 rate class