LC:=REF(CLOSE,1);RSI1:=SMA(MAX(CLOSE-LC,0),6,1)/SMA(ABS(CLOSE-LC),6,1)*100;XG:RSI1<=20;参考资料：http://tieba.baidu.com/f?kw=%B9%C9%C6%B1%B9%AB%CA%BD%D7%A8%BC%D2
