所屬欄目:英漢雙解無機化學(xué)
A soft,silvery-white,highly ra-dioactive metallic element of group 3 (for-merly ⅢB) of the periodic table. It is usual-ly considered to be the first member of theACTINOID series. It occurs in minute quan-tities in uranium ores as a result of the natu-ral ......(本文共 842 字 ) [閱讀本文] >>