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（2012?湖州）如图装置可验证二氧化碳和氢氧化钠发生了化学反应：将等量的氢氧化钠溶液和蒸馏水分别加入两瓶等量二氧化碳气体中，用U型管连接．充分反应后放在水平桌面上可观察到U型管中液面出现高度差． （1）室温下利用此装置，你还可以研究____ ____． A．比较氧气和二氧化碳在水中的溶解能力 B．比较氯酸钾和氯化钠在水中的溶解能力 C．比较饱和氢氧化钠和氢氧化钙溶液吸收二氧化碳气体的能力 （2）进一步思考、迁移：有____ ____变化的对比实验都可以用此装置进行探究．
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A.
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