指出下列程序中的错误： STAKSG SEGMENT DB 100 DUP(?) STA SG ENDS DTSEG SEGMENT DATAl DB ？ DTSEG END CDSEG SEGMENT MAIN PROC FAR START： MOV DS.DATSEG MOV AL.34H ADD AL，4FH MOV DAT@A@AL START ENDP CDSEG ENDS END