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exchange.GetRecords()的文档说明：返回值为Record结构体数组，返回的K线数据会随时间累积，最多累积到2000根，然后会更新加入一根同时删除一根最早时间的K线柱（如队列进出）。
1、那么我利用exchange.SetMaxBarLen(2000)，是不是可以在初次获取的时候就直接获取到最近2000根相应周期（15min）的bar的数据呢？
2、然后用var records = exchange.GetRecords(PERIOD_M15) var obv = TA.OBV(records) 是否就可以获取这2000根bar对应的obv的数值呢？
谢谢！
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