若BX=1000H,DS=2000H,(21000H)=12H,(21001H)=34H。执行MOV SI,[BX]指令后SI=()
A1234H
B3412H
C1000H
D0010H
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若DS=1000H,BX=2000H,(12000H)=56H,(12001H)=78H,AX=1000H,执行“ADDAX,[BX]”指令后,AX=()。
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