现有(DS)=2000H,(BX)=0100H,(SI)=0002H,(20100H)=12H,(20101)=34H,(20102H)=56H,(20103H)=78H,(21200H)=2AH,(21201H)=4CH,(21202H)=0B7H,(21203H)=65H,下列指令执行后AX寄存器的内容: MOV AX ,1200H ;(AX)= MOV AX ,BX ;(AX)= MOV AX ,[1200H] ;(AX)= MOV AX ,[BX] ;(AX)= MOV AX ,1100H[BX] ;(AX)= MOV AX ,[BX][SI] ;(AX)= MOV AX ,1100H[BX+SI] ;(AX)=