【简答题】Give examples of needs, wants, and demands that Build-A-Bear customers demonstrate, differentiating each of these three concepts. What are the implications of each on Build-A-Bear’s actions?
【单选题】在电子表格中,单元格A1,B1, C1, A2, B2, C2中的值分别为1、2、3、4、5、6,若在单元格D2中输入公式“=A1+B1-C1",按Enter键后,则D2单元格中的值为()。