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.The extraction mechanism and separat...
Brittleness is often a result of alloying.脆性往往是合金化的一种结果.Meanwhile, inherent brittleness of urushiol has limited its development and application.同时, 漆酚清漆固有的脆性等也限制了其发展和应用.However, there are not consistent brittleness index...