The film A World Without Thieves a great success and brought in a large profit to the cinema. A.was enjoyed B.enjoyed C.is enjoyed D.enjoys 答案:B
自来水生产中常通入适量的氯气进行杀菌消毒,氯气与水反应的产物之一是盐酸.市场上有一些不法商贩为牟取暴利,用自来水冒充纯净水(蒸馏水)出售.能用来鉴别纯净水真伪的试剂是
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A.酚酞试液
B.氯化钡溶液
C.硝酸银溶液
D.氢氧化钠溶液