1 . Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 ( actinium ) through 103 ( lawrencium ).

锕类任何化学性质相似, 原子序数在89 ( 锕 ) 与103 ( 铹 ) 之间变化的放射性元素.

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2 . The extraction mechanism and separation process of lanthanum and actinium were studied in HDEHP ( kerosene ) NO 3 system.

本文研究了在HNO_3体系中,P_ ( 204 ) 萃取La和 Ac的 机理及影响La, Ac萃 取分离因素,给出了La, Ac分配的数学摸型.

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3 . The extraction mechanism and separation process of lanthanum and actinium were studied in HDEHP ( kerosene ) - HNO 3 system.

研究了在HNO_ 3体系中,P_ ( 204 ) 萃取La和 Ac的 机理及影响La, Ac萃取分离因素,给出了La, Ac分配的数学模型.

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