【单选题】【消耗次数：1】
There were some chairs left over[] everyone had sat down.
①
when
②
until
③
that
④
where
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将硫酸钡溶于水，不导电，所以硫酸钡是非电解质
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氢硫酸溶液中，<img class="kfformula" src="20200707/1594093434973347.png" data-latex="C{(H}^{+})=2C({S}^{2-})" width="163" height="37"/>
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<img class="kfformula" src="20200629/1593409727229414.png" data-latex="{C1}_{2}" width="44" height="35"/>
②
<img class="kfformula" src="20200629/1593409727821569.png" data-latex="{CH}_{3}COOH" width="112" height="30"/>
③
<img class="kfformula" src="20200629/1593409727573229.png" data-latex="{NH}_{4}{HCO}_{3}" width="110" height="27"/>
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<img class="kfformula" src="20200629/1593409727193939.png" data-latex="{SO}_{2}" width="48" height="31"/>
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0.02mol/L醋酸与0.02mol/LNaOH溶液等体积混合
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0.01mol/L醋酸溶液
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0.02mol/L醋酸与0.01mol/LNaOH溶液等体积混合
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③
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先褪色后复原
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慢慢褪色
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颜色不褪
④
立刻褪色