股价放量向上突破,布林线指标开口扩大后的选股公式。公式模块 N:=20;BOLL:=MA(CLOSE,N);UPPER:=BOLL+2*STD(CLOSE,N);LOWER:=BOLL-2*STD(CLOSE,N);DD:=UPPER-LOWER;XG:CROSS(0.5,DD=LLV(DD,30));