题目

-Hello, may I speak to Peter?     -Sorry, he isn’t in at this moment. ________ a message?     A. Can I leave  B. Can I take C. Can you bring  D. Can you get 答案:B(5分) 硝酸可发生反应:。据此回答: (1)反应的基本类型属于          反应。(2)X的化学式为               ,推断的依据为                         。(3)硝酸的保存应注意                  、                 。
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