主题：[求助]麻烦老师帮我修改一下！

MA5:=MA(C,5);  //5个周期收盘价的简单移动平均
MA10:=MA(C,10);//10个周期收盘价的简单移动平均
MA20:=MA(C,21);//20个周期收盘价的简单移动平均
pk:=(C>=O AND CROSS(MA5,MA10)) or (C<O AND CROSS(MA10,MA20));
pd:=(C>=0 AND CROSS(MA10,MA5)) or (C<0 AND CROSS(MA20,MA10));
if pk then begin
sellshort(holding<0,holding,market);
buy(holding,1,market);
end
if pd then begin
sell(holding>0,holding,market);
buyshort(holding=0,1,market);
end