主题：程序没交易错在哪里求帮助

压力位:ylw,COLORGREEN,LINETHICK2;   

hi20:=ref(压力位,2);
lo20:=ref(支撑位,2);
if holding>0 and Cross(lo20,C) then
begin
 sell(1,1,limitr,lo20-2*limitr);//止损
 BUYSHORT(1 ,1 ,limitr ,lo20-2*limitr );
 end
 

if holding<0 and Cross(C,hi20) then
begin
 sellshort(1,1,limitr,hi20+2*mindiff);//止损
 BUY(1 ,1 ,limitr ,hi20+2*mindiff);
end
 //开多
 buy(holding=0 and Cross(C,hi20),1,limitr,hi20+2*mindiff);

if holding=0 and  Cross(lo20,C) then //开空
 buyshort(1,1,limitr,lo20-2*mindiff);