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下列说法不正确的是( ) A.变色硅胶干燥剂含有CoCl2,干燥剂呈蓝色时,表示不具有吸水干燥功能 B.“硝基苯制备”实验中,将温度计插入水浴,但水银球不能与烧杯底部和烧杯壁接触 C.“中和滴定”实验中,容量瓶和锥形瓶用蒸馏水洗净后即可使用,滴定管和移液管用蒸馏水洗净后,须经干燥或润洗后方可使用 D.除去干燥CO2中混有的少量SO2,可将混合气体通过盛有酸性KMnO4溶液、浓硫酸的洗气瓶
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