X_1:=OPEN<CLOSE;X_2:=OPEN/REF(CLOSE,1)<=0.97;X_3:=CLOSE/OPEN>=1;X_4:=CLOSE/OPEN>1.02;X_5:=HIGH/LOW<CLOSE/OPEN<0.08;低开:X_1 AND X_2 AND X_4 AND X_5;