【单选题】【消耗次数：1】
电解质是（ ）。
①
在水溶液和熔融状态下都能导电的物质
②
导电性很强的物质
③
可溶性盐类
④
在水溶液或熔融状态下能导电的化合物
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下列物质的水溶液能导电，但属于非电解质的是（）。
①
<img class="kfformula" src="20200629/1593409727229414.png" data-latex="{C1}_{2}" width="44" height="35"/>
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