求解答一道关于定积分的题!

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• 1The food and agricultural products sold by the US to Russia in 2013 were worth______:.A．$1

  The food and agricultural products sold by the US to Russia in 2013 were worth______:.

  A．$1.3 billion

  B．$1.6 billion

  C．$13 billion

  D．$16 billion

  请帮忙给出正确答案和分析，谢谢！

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• 2求一道定积分的题的解题过程∫lntanx dx,积分区间是0到∏/2.我说错题了,应该是∫lnsin
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• 3Which of the following is TRUE about the industry of fish farm？A．It is the newest industry

  Which of the following is TRUE about the industry of fish farm？

  A．It is the newest industry in the world.

  B．It is developing at a fast speed every year.

  C．It is at the peak of the development now.

  D．It has been developing for decades.

  请帮忙给出正确答案和分析，谢谢！

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• 4高数积分问题：麻烦高手帮我看一下这个积分怎么算?
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• 5Which of the following statements is INCORRECT about Asian grocery stores？A．They have thei

  Which of the following statements is INCORRECT about Asian grocery stores？

  A．They have their own catfish farms in California.

  B．They are in great need of live fish.

  C．They import fish from the other side of the world.

  D．They need more fish than provided.

  请帮忙给出正确答案和分析，谢谢！

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• 6Dangerous animals may withdraw when______.A．their eyes are hurtB．they see people aroundC．t

  Dangerous animals may withdraw when______.

  A．their eyes are hurt

  B．they see people around

  C．they feel a danger

  D．they can"t hear anything

  请帮忙给出正确答案和分析，谢谢！

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• 7高数 求定积分
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• 8高数积分题,具体过程!nlim sin(π/n) ∑ [1/(1 + Cos[k/n])]无穷大
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• 9在我国，空气绝对湿度最低值出现在（)。A.1月份B.2月份C.7月份D.8月份

  在我国，空气绝对湿度最低值出现在()。

  A.1月份

  B.2月份

  C.7月份

  D.8月份

  此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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• 10Which of the following best explains the meaning of " She said we should finish the work a

  Which of the following best explains the meaning of " She said we should finish the work as soon as possible" ？

  A．She said that we were going to finish the work.

  B．She ordered that we must finish the work.

  C．She suggested that we finish the work in time.

  D．She advised us not to finish the work unless we meet the deadline.

  请帮忙给出正确答案和分析，谢谢！

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