把精确控盘指标改选股预警
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编写要求：

20,POINTDOT;80,POINTDOT;VAR1:=(2*C+H+L)/4;VAR2:=LLV(LOW,33);VAR3:=HHV(HIGH,33);AA:EMA((VAR1-VAR2)/(VAR3-VAR2)*100,10),COLORRED;BB:EMA(AA,10)COLOR00FFFF;DRAWBAND(AA,RGB(200,0,0),BB,RGB(0,200,200));DRAWICON(CROSS(AA,BB),BB-13,1);DRAWICON(CROSS(BB,AA),AA+13,2);STICKLINE(AA<20,2,7,1,1),COLORFF00FF;STICKLINE(AA>80,92,97,1,1),COLOR00FFFF;IF(AA>=BB,100,108);IF(AA=BB,105,1);DRAWICON(BB>AA,-8,2);STICKLINE( CROSS(AA,BB),-8,15,1,0),COLORRED,LINETHICK2;STICKLINE( CROSS(AA,BB),1,6,1,0),COLOR00FFFF,LINETHICK2;DRAWICON(CROSS(AA,BB),13,13);STICKLINE( CROSS(BB,AA),108,85,1,0),COLOR00FF00,LINETHICK2;STICKLINE( CROSS(BB,AA),94,99,1,0),COLORFF00FF,LINETHICK2;DRAWICON(CROSS(BB,AA),85,14);选股条件：出现红球拐点选股

解答：

 VAR1:=(2*C+H+L)/4;

VAR2:=LLV(LOW,33);
VAR3:=HHV(HIGH,33);
AA:=EMA((VAR1-VAR2)/(VAR3-VAR2)*100,10);
BB:=EMA(AA,10);
XG:CROSS(AA,BB);

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