正比例directr general of caac: 中國民航局局長directpositive image: 正象directradiation scintillation counter: 直接照射閃爍計(jì)數(shù)器directplunger elevator: 活塞直接驅(qū)動(dòng)升降機(jī)directreadafterwritedraw: 寫后直接讀下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯