压裂液对地层及填砂裂缝的伤害具体原因有哪些?

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问题:

压裂液对地层及填砂裂缝的伤害具体原因有哪些?

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The traffic is not busy now. We             arrive before dark.

A.should

B.mustn’t

C.need

D.can’t

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检验一瓶气体是否是二氧化碳的正确方法是[ ]

A.将燃烧的木条伸入瓶中,观察木条是否熄灭

B.将燃烧的木条伸到集气瓶口观察木条是否熄灭

C.向瓶内倒少量澄清石灰水,观察石灰水是否变浑浊

D.放入一只小动物,观察小动物能否存活

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For more than two centuries, American’s colleges and universities have been the backbone of the country’s progress. They have educated the technical, managerial, (1) and provided generation after generation of national leaders. Today educators from around the globe are turning to U. S. institutions of higher learning (2) . They are apt to find many reasons for the excellence of American universities, but (3) stand out as watersheds:
Education (4) : In 1862 Congress enacted the Land-Grant College Act, which essentially extended the opportunity of higher education (5) , including such disenfranchised groups as women and minorities. Each state was permitted to sell large tracts of (6) and use the proceeds to endow at least one public college.
(7) : Over the years, the decentralization and diversity of the America’s colleges and universities have promoted competition for students and resources. Competitive pressure first arose (8) . The academy’s impact really grew after World War II, when (9) commissioned by President Roosevelt argued that it was the federal government’s responsibility to (10) for basic research. Instead of being centralized in government laboratories, scientific research (11) in American universities and generated increasing investment. It also gave graduate students research opportunities and helped (12) far and wide, to the benefit of industry, medicine and society as a whole.
(13) : The end of the World War II saw passage of the Servicemen’s Readjustment Act of 1944. The law, which provided for (14) for returning veterans, made an already democratic higher-education system accessible in ways that were (15) in Europe, opening the doors of the best universities to men and women who had (16) of going to college.
(17) : The creation of federal loan guarantees and subsidy programs, as well as outright grants for college students brought (18) to higher education and further helped to democratize access. Since its founding (19) , the Federal Family Education Loan Program has funded more than 74 million student loans worth more than (20) .

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在微机的硬件设备中,即可以做输出设备又可以做输入设备的是______。

A.绘图仪
B.扫描仪
C.手写笔
D.磁盘驱动器

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模拟处理离子交换器在再生过程发生“乱层”现象时实际操作处理?

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