飞狐简单即完美，慢慢领会，寻牛指标

快线:=(CLOSE-LLV(LOW,9))/(HHV(HIGH,9)-LLV(LOW,9))*100,LINETHICK2,COLORRED;
慢线:=SMA(快线,3,1),COLORCYAN;
空:=SMA(慢线,3,1),COLOR00FF00;
牛股:BARSLAST(CROSS(慢线,空))<9 AND CROSS(慢线,空) AND 慢线<20