标题：这样循环，在同一个交易系统里能否实现？

ma30:ma(c,30);

ma60:ma(c,60);

if cross(h,ma30) then begin

    sellshort(1,1,market);

    buy(holding=0,1,market);

end

if cross(h,ma60) then begin

    sellshort(1,1,market);

    buy(holding=1,1,market);

end

if cross(ma30,l) then begin

    sell(1,1,market);

    buyshort(holding=0,1,market);

end

if cross(ma60,l) then begin

    sell(1,1,market);

    buyshort(holding=-1,1,market);

end