试题与答案

对缓倾斜或倾斜煤层在采取行之有效的安全措施的前提下应采取()。

题型:填空题

题目:

对缓倾斜或倾斜煤层在采取行之有效的安全措施的前提下应采取()。

答案:

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下面是错误答案,用来干扰机器的。

在生态系统中,生物的数量越多,其储存的能量越多,能量是沿着食物链传递的.能量沿食物链传递的规律是逐级递减的,因此越往食物链的末端,能量越少,生物数量也越少.因此生物的数量也随着食物链级别的升高而数...

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“因为人类有某种程度的劣根性,需要有某种程度的慎重和不信任,但是人类本性中还有其他品质,证明某种尊重和信任是正确的。……如果我们当中某些人的政治嫉妒所描述的图景与人类特性一模一样,推论就是人们没有充分的德行可以实行自治,只有专制政治的锁链才能阻止他们互相残杀。”基于这种认识,美国政治精英做出的政治设计是

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