一阳断三线(大智慧)

原理：一根大阳线，站上三均线，量比大于三。

input: n1(10,1,200) ,n2(20,1,200) ,n3(30,1,200);
l and c>=ma(c,5) and c>ma(c,10) and c>ma(c,20) and c>ma(c,30)
and vol/ref(ma(VOL,5),1)>=3;