已知(DS)=2000H,(BX)=0100H,(SI)=0002H, (20100H)=12H,(20101H)=34H, (20102H)=56H,(20103H)=78H, (21200H)=9AH,(21201 H)=BCH, (21202H)=DEH,(21203H)=F0H, 试说明下列各条指令源操作数的寻址执行AX寄存器的内容 (1)MOV AX,1200H (2)MOV AX,BX (3)MOV AX,[1200H] (4)MOV AX,[BX] (5)MOV AX,1100H[BX] (6)MOV AX,[BX][SI] (7)MOV AX,1100H[BX][SI]