delphi 二维数组的大小和元素个数问题

type

TComplex = record
Real : Single;
Imag : Single;

end;

TKArray=array [1..2048,1..2048] of TComplex;

var
lcArr:TKArray;
lcC:Integer;

lcArr2:Array of Array of TComplex;
begin
Memo1.Lines.Clear;
Memo1.Lines.Add('TKArray [2048 x 2048]:');
lcC:=SizeOf(lcArr);
Memo1.Lines.Add('总大小：'+IntToStr(lcC)); {33554432}
lcC:=SizeOf(TComplex);
Memo1.Lines.Add('元素大小：'+IntToStr(lcC)); {8}
lcC:=SizeOf(lcArr) div SizeOf(TComplex);
Memo1.Lines.Add('元素个数：'+IntToStr(lcC)); {4194304}
Memo1.Lines.Add('--------------------------------------');
Memo1.Lines.Add('第一维元素个数：'+IntToStr(Length(lcArr))); {2048}
Memo1.Lines.Add('第二维元素个数：'+IntToStr(Length(lcArr[1]))); {2048}
Memo1.Lines.Add('--------------------------------------');

Memo1.Lines.Add('动态数组');
SetLength(lcArr2,1024,1024);
Memo1.Lines.Add('第一维元素个数：'+IntToStr(Length(lcArr2))); {1024}
Memo1.Lines.Add('第二维元素个数：'+IntToStr(Length(lcArr2[0]))); {1024}