hf常温下是气态。氟化氢在常态下是一种无色、有刺激性气味的有毒气体，具有非常强的吸湿开发者_如何转开发性，接触空气即产生白色烟雾，易溶于水，可与水无限互溶形成氢氟酸。氟化氢分子间具有氢键，可表现出一些反
I have got a simple MySQL table and primary index (id) is not numbered one by one 开发者_Python百科(1, 31, 35, 100 etc.). I want them to be numbered like (1, 2, 3, 4). Please tell me how to do it. I w
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