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第七章:1.与水基钻井液相比,油基钻井液的优点和缺点是什么? 2.油基钻井液目前主要在什么情况下使用? 3.除油相和之外油基钻井液中的必要组分还有哪些?它们各起什么作用? 第十章:1.影响井壁失稳的因素主要有哪些? 6.井漏的会造成什么危害?试阐述发生井漏的原因和防止井漏的主要措施。
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【单选题】According to the passage, the U.S. immigrants in the period from 2000 to 2050 will probably increase
A.
129 million
B.
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C.
75 million
D.
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【单选题】It can be inferred from the text that by year 2050 ______
A.
the species of plants and animals will shrink to one third of the original amount.
B.
the climate will become unsuitable for residence.
C.
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D.
most animals will change their habitats to a large extent.
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