网友求助：
求A,B二线向上并行，股价跌破B线和触及B线时的预警选股公式。
A:EMA(EMA(EMA(EMA(CLOSE,2),2),2),2);
B:EMA(REF(A,1),2);
partline(b,b>=ref(b,1),rgb(250,40,40)),linethick4;
A3:=(C-LLV(L,9))/(HHV(H,9)-LLV(L,9))*100;
A4:=SMA(A3,3,1);
A5:=SMA(A4,3,1);
A6:=3*A4-2*A5;
A7:=C-REF(C,1);
A8:=100*EMA(EMA(A7,6),6)/EMA(EMA(ABS(A7),6),6);
解答如下：
A1:=EMA(EMA(EMA(EMA(CLOSE,2),2),2),2);
B:=EMA(REF(A1,1),2);
l<b and a1>b;
