DEA:=EMA(DIF,9);
macd:=(DIF-DEA)2;
boll:=MA(CLOSE,20);
UPPER:=BOLL+2STD(CLOSE,20);
LOWER:=BOLL-2STD(CLOSE,20);
K1:=CLOSE OPEN ;
K2:=vol =2REF(VOL,1);
K3:=crOSS(DIF,DEA) AND DIF
K4:=CROSS(CLOSE,BOLL);
选股:K1 AND K2 AND K3 AND K4 ;