老师：5 10 20均线多头排列，K线大于10 小于20开多，连续阴线大于等于3且高点和低点差大于20跳平仓
ma5:ma(c,5);
ma10:ma(c,10);
ma20:ma(c,20);
cd1:ma5<ma10 and ma10<ma20;
cd2:c>ma10 and c<ma20;
cd3:count(c<o,3)=3;
cd4:h-l>20*MINDIFF;
if cd1 and cd2 then buy(holding=0,1,market);
if cd3 and cd4 then sell(holding>0,holding,market);