题目

They were s___________ at the news that he had cheated in the exam. 答案:shocked化学与生产、生活密切相关,下列叙述错误的是( )·A.用热的的纯碱溶液清除灶具上的油污B.用硫酸清洗锅炉中的水垢C.用明矾[KAl(SO4)2 ·12H2O]作净水剂,除去水中悬浮的杂质D.用Na2S作沉淀剂,除去废水中的Cu2+和Hg2+
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