//获得万科A在2011-09-09 14:15:33的10s线交易明细买2量。
ov:=BackUpSystemParameters();
setsysparam(pn_stock(),'SZ000002');
setsysparam(PN_Cycle(),cy_10s());
setsysparam(pn_date(),strtodatetime('2011-09-09 14:15:33'));
v:=td_buy2c();
RestoreSystemParameters(ov);
return v;