主题：[求助]防止秒杀的的语句哪里有问题？

if 超级止损d and tholding2>0 then
begin
tsell(超级止损d,0, MKT);
end

if 超级止损k and tholding2<0 then
begin
tsellshort (超级止损k,0,mkt);
end

//开盘时的资产值
xx:=if(date<>ref(date,1),tasset,0);

期初权益:=valuewhen(xx>0,xx);

当天盈亏:=tasset-期初权益;

if 当天盈亏>25000 and tholding2>0 then
begin
tsell(1,0, MKT);
end

if 当天盈亏>25000 and tholding2<0 then
begin
tsellshort(1,0,mkt);
end