N:=25; A:=1,COLORGREEN; 頂:1.,COLORGREEN; BOLL:=MA(CLOSE,N); UPPER:=BOLL+2*STD(CLOSE,N); LOWER:=BOLL-2*STD(CLOSE,N); BB:(C-LOWER)/(UPPER-LOWER),COLORYELLOW,LINETHICK2; 買入:CROSS(BB,0),COLORMAGENTA;
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