趋势线:  3*SMA((CLOSE-LLV(LOW,27))/(HHV(HIGH,27)-LLV(LOW,27))*100,5,1)-2*SMA(SMA((CLOSE-LLV(LOW,27))/(HHV(HIGH,27)-LLV(LOW,27))*100,5,1),3,1);  

见底信号:  10;  

买点准备:  IF(趋势线<=10,50,0);  

买入时间:  IF(CROSS(趋势线,见底信号),100,0);