n.分級(jí)存取時(shí)間 ham hierarchical access method: 分層存取法hierarchical access method: 層次存取法hierarchical direct access method: 層次直接存取方法; 分層直接存取法; 分層直接存權(quán)hierarchical indirect access method: 層次間接存取法hierarchical sequence access method: 分層順序存取法下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯