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硒酸钠 (sodium selenite) 是一种化学物质，它是由硒和钠共同组成的硫酸盐。它是一种无色或淡黄色晶体，具有较强的毒性。硒酸钠可以从含硒矿石中提取，也可以通过化学反应合成。它常用作化学试剂、染料、防腐剂和植物生长促进剂。一些英文
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