试题与答案

探放水钻孔的布置方式和()有关。 A.巷道类型 B.煤层产状 C.煤层厚度 D.煤层

题型:多项选择题

题目:

探放水钻孔的布置方式和()有关。

A.巷道类型

B.煤层产状

C.煤层厚度

D.煤层类别

E.煤层倾角

答案:

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参考答案:经济学跟源于资源的稀缺性与人类欲望的无限性之间的矛盾。资源的稀缺性是指相对于人类无限的欲望来说,满足欲望的资源总是有限的、不足的。资源的稀缺性与人类欲望的无限性之间的矛盾导致以下四个基本...

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