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【简答题】
过点A(1,-1)向直线l作垂线,垂足为B(-3,1).求直线l的方程.
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【多选题】Which of the following statements about the land ethic are correct?
A.
Aldo Leopold (1887–1948) wrote, among other things, the famous essay, "The Land Ethic." In it, Leopold argues that our relationship with the land is an ethical one in which we understand ourselves as being a part of a biotic community that includes the land.
B.
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C.
Such an outlook has been called ethical holism because ethical judgments about projects involving nature are made from this perspective.
D.
Pivotal to this understanding is the notion of a land pyramid in which one distinguishes the importance of the pyramid's lower layers: the soil and the primary producers.
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