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节日期间因燃放鞭炮会引起空气中SO 2 含量增高，造成大气污染。某实验小组同学欲探究SO 2 的性质，并测定空气中SO 2 的含量。 （1）他们设计如下实验装置，请你参与探究，并回答问题： ①装置A 1 中发生反应的化学方程式为 ； ②装置B用于检验SO 2 的漂白性，其中所盛试剂为 ，装置D用于检验SO 2 的 性质； ③装置C中反应的离子方程式为 ； ④为了实现绿色环保的目标，甲同学欲用装置A 2 代替装置A 1 ，你认为装置A 2 的优点是（写二点） 、 ； （2）他们拟用以下方法测定空气中SO 2 含量（假设空气中无其他还原性气体）。 ①你认为哪个装置可行（填序号） ，使用你所选用的装置测定SO 2 含量时，还需要测定的物理量是 ； ②你认为哪个装置不可行（填序号） ，说明理由 。
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【单选题】采用标准法测定水泥标准稠度用水量时,当标准试杆自水泥净浆表面自由沉入 净浆,30s时距底板 ( ) mm 为标准稠度净浆
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【单选题】Which of the following has happened since the invention of the Internet and e-mail?
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【简答题】用标准法测定标准稠度用水量时,以试杆沉入净浆并距底板 mm的水泥净浆为标准稠度净浆。
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