跨期合约的K线等数据怎么下载

symbol = ‘DCE.SP i2605&i2609’
kline1 = api.get_kline_serial(symbol, 5*60 ,10)
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raise TqTimeoutError(“获取 %s (%d) 的K线超时，请检查客户端及网络是否正常” % (symbol, duration_seconds))