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Description
K线数据记录数多时，线都挤在一堆，看不情，再多的情况下mpf还会提示：数据太多了，你看不清。那为什么不加一个滚动条，把K线间距拉大，也能让用户看清楚呀
如果加了滚动条就不用在乎数据记录的多少了，只是用户担心自己电脑的性能
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