①图中NO₃^﹣的名称是____．

②该反应的本质是____结合生成沉淀．

③请再用AgNO₃作反应物之一，写出另一个与上述反应本质相同的化学方程式：____．

函数y=cos²x﹣sin²x的最小正周期T=____ 

    I was waiting on the station platform for the Tianjin train when a man asked me if I knew the time of the next train to Tianjin. I often had to go there myself, so I knew and told him. A few minutes later an old lady wanted to know whether the train to Shanghai had already left. I knew that it had not, So of course, I told her. Then a girl came to me and asked why the train from Nanjing was late. I just told her that when trains were late, it was usually because something had happened. I was wondering why all these people were asking me those questions when I noticed that I was standing next to a sign that said "Inquiry Office."

北方寒冷的冬天，居民楼的玻璃窗上会结“冰花”，“冰花”是水蒸气____ （填物态变化的名称）生成的，出现在玻璃窗的____ 表面（选填“内”或“外”），此时小芳拿起湿抹布去擦时，抹布却粘在了玻璃上，这是因为发生了____ （填物态变化的名称）现象．

与其……     不如……          只有…… 才……

尽管 ……    还是 … …        因为……所以……

不仅……       还……

①我们____把轮船停在港口，____冒着狂风暴雨前进。

②____从小学好本领，____更好地为国家建设出力。

③鲁迅____是伟大的文学家，____是伟大的思想家和革命家。