| 单词 | manganese |
| 释义 | manganese /mang"geuh nees', -neez'/, n. Chem. a hard, brittle, grayish-white, metallic element, an oxide of which, MnO2 (manganese dioxide), is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. Symbol: Mn; at. wt.: 54.938; at. no.: 25; sp. gr.: 7.2 at 20°C. [1670-80; < F manganèse < It manganese, alter. of ML magnesia MAGNESIA] |
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