單位制 development systems unit: 開(kāi)發(fā)系統(tǒng)股information systems unit: 信息系統(tǒng)股management information systems unit: 管理信息系統(tǒng)股operating systems unit: 操作系統(tǒng)股records information systems unit: 記錄信息系統(tǒng)股下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯