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个人做量化，买不起专业数据库，如何获取 L2数据?
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如果我写个脚本，一直跌的股票一旦上涨就立刻（1s内）买，接着一旦下跌就立刻（1s内）卖，会怎样？
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有哪些事情是MacOS做不到但Linux可以做到的？
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突然发现自己变老是怎样一种体验？
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一个人可以固执到什么程度？
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