题目

Mary is really good at taking notes in class. She can       almost every word her teacher says.    A. put out                       B. put down    C. put away                      D. put together 答案:B实验室有失落标签的4瓶无色溶液:MgCl2、NaCl、HCl、NaOH,现实验桌上只有1瓶酚酞试液。请你设计只用瓶酚酞试液鉴别上述溶液的实验方案。 实验设计方案 实验步骤 预计产生的实验现象和由此得出的结论 (1) (2)
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