编写条件:MACD零轴下初次死叉选股公式.
编写方法:CROSS("MACD.DEA","MACD.DIF") AND "MACD.DEA"<0 AND COUNT(CROSS("MACD.DEA","MACD.DIF")
AND "MACD.DEA"<0,BARSLAST(CROSS(0,"MACD.DEA")))=1;
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