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　　物??(wu)理??(li)化?(hua)學(xué)??(xue)特??(te)征??(zheng)：外??(wai)觀??(guan)通??(tong)常??(chang)呈??(cheng)白?(bai)色??(se)針??(zhen)狀??(zhuang)結(jié)??(jie)晶??(jing)體??(ti)??，暴??(bao)露??(lu)于??(yu)空??(kong)氣??(qi)當(dāng)??(dang)中??(zhong)會(huì)??(hui)逐??(zhu)漸??(jian)變??(bian)紅??(hong)??，易??(yi)溶?(rong)于??(yu)水??(shui)、乙??(yi)醇?(chun)、乙??(yi)醚??(mi)??，溶??(rong)于??(yu)氯??(lv)仿??(fang)、四??(si)氯??(lv)化??(hua)碳??(tan)??，不??(bu)溶??(rong)于??(yu)苯??(ben)??。??。