NH3·H2O中的N元素的化合价为
侯英超 |
发布日期：2010-06-28 05:05:57
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被蚊虫叮咬后。涂些含有碱性物质(如NH3·H2O)的药水，可减轻痛痒NH3·H2O中的N元素的化合价为 A.-3 B.0 C. +3 D.+5 |
