The average surface temperature of Earth keeps around 15℃.
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在Excel中，设A1单元格的值为10，A2单元格中的值为20，在A3单元格中输入"A2-A1”，则A3单元格中的值为(53)。
A. 10
B. -10
C. A2-A1
D. ######
Why can the police help you to find out directions within a neighborhood？
A. They can fax you a map of the neighborhood.
B. They often visit each house in the neighborhoo
C. They know the name of each street in the neighborhood.
D. They have a map of all the buildings in the neighborhood.
土地出让期届满，政府有偿收回出让的土地使用权及地上建筑物。()
A. 正确
B. 错误
以下关于围护结构传热阻R0的单位，正确的为()。
A. (m2.℃)/w
B. (m2.℃)/kcal
C. (m.k)/w
D. w/(m2.℃)
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