A是含碳化合物，下图表示A、B、C、D、E、F、G七种常见物质间的转化关系，其中反应①是工业上制取C的重要反应，反应②
中F足量，反应③曾是工业上制F的方法．
（1）写出化学式：B______，C______．
（2）写出化学方程式：反应③______．
（1）A是含碳物质，能生成B和C，则A可能是碳酸钙，生成的B和C为氧化钙和二氧化碳，B能与F反应生成D和G，G能与C反应，则B可能是二氧化碳，二氧化碳与F氢氧化钠反应生成碳酸钠和水，G可能是水，与氧化钙反应生成E氢氧化钙，氢氧化钙能与碳酸钠反应生成碳酸钙和氢氧化钠，故填：CO2，CaO；
（2）氢氧化钙能与碳酸钠反应生成碳酸钙和氢氧化钠，故填：Ca（OH）2+Na2CO3=CaCO3↓+2NaOH．
| 电脑键盘上的字母为何不按顺序排列？请你来做一项统计，下面是一篇小短文，根据短文中字母a，b出现的机会完成后面提出的问题： Two Trips Jack brought a small plane and began to fly it． He soon became excited and made his plane all kinds of tricks． Jack had a friend，named Tom． One day Jack said to him，“I will pick you up in my plane．““I will be glad to．'answered Tom． They went up，and Jack flew around for half an hour and did all kinds of tricks in the air． Then they came down． Tom was to be back safely，and said to Jack，“Well，Jack，thank you very much for those two trips in your plane．“Jack was very surprised and asked，“Two trips？““Yes，my first and my last．'an-swered Tom． 根据上文填表
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