编写要求：
www.gszx.com.cn网解答：
网友求助：
请老师做个“牛大汉”处选股，谢谢啦！！
REFLINE: 0, 20, 50, 80, 100;
RSV:=(CLOSE-LLV(LOW,N))/(HHV(HIGH,N)-LLV(LOW,N))*100;
K:SMA(RSV,M1,1);
D:SMA(K,M2,1);
J:3*K-2*D;
解答如下：
XXBB:= EMA((CLOSE-LLV(LOW,25))/(HHV(HIGH,25)-LLV(LOW,25))*4,5)*100;
牛大汗:REF(XXBB,1)<50 AND XXBB-REF(XXBB,1)>25;
