單位需求量 quantity required: 所需數(shù)量; 需求數(shù)量; 需要數(shù)量required air quantity: 所需空氣量unit of quantity: 數(shù)量單位unit quantity: 單位電荷; 單位量failed start unit command required: 錯誤必須啟動系統(tǒng)命令下載手機詞典可隨時隨地查詞查翻譯