当前位置:首页 > 浙江线上大学答案 > 【单选题】羟基蒽醌对Mg(Ac)2呈蓝-蓝紫色的是()A. 1,8-二羟基蒽醌 B. 1,4-二羟基蒽醌 C. 1,2-二羟基蒽醌 D. 1,6,8-三羟基蒽醌

【单选题】羟基蒽醌对Mg(Ac)2呈蓝-蓝紫色的是()A. 1,8-二羟基蒽醌 B. 1,4-二羟基蒽醌 C. 1,2-二羟基蒽醌 D. 1,6,8-三羟基蒽醌

2020-07-10 00:39:41 [优学院答案] 来源:超星题库网

柳青在皇甫村生活期间,完成了《创业史》。

  • 正确
  • 错误

Which of the following is not mentioned as one of the sources of new fashion ideas?

  • Books
  • Music
  • Internet
  • Movie

Who may influence fashion?

  • The royals
  • Political figures
  • Cultural icons
  • All of the above

Which of the following is not true according to the passage?

  • Clothes separate people into groups.
  • Clothing is seldom used as a political weapon.
  • Clothes may tell stories about the people who wear it.
  • Clothes may create stereotypes and distance between groups.

【单选题】羟基蒽醌对Mg(Ac)2呈蓝-蓝紫色的是()A. 1,8-二羟基蒽醌 B. 1,4-二羟基蒽醌 C. 1,2-二羟基蒽醌 D. 1,6,8-三羟基蒽醌

Direction: Now please watch the video once more and try to fill in the blanks of what Zach talked about in the video.(本部分从3分15秒开始,5分22秒结束) When you are done, you could check the answers in the next page later. “I can bench-press 445 [填空1]I can flip a 275 tire, I can do handstand pushups, and I can climb a rope and I can look damn [填空2] doing it.I’m Zach Rule, adaptive crossfitter and [填空3]. I was born with a [填空4] and pretty much my legs looked real messed up, so I’d never be able to walk using them, so they made a decision to get them [填空5]. I’ve been an amputee—a double amputee—since I was [填空6] years old.”“My relationship with [填空7]started out in high school. I started lifting weights just like anybody else and I always did it for [填空8] at first and if I’m going to be a torso, I’m going to be one damn good looking torso and then it just took over my life.I like wanted to know everything there is to know about [填空9], the human body, how to get stronger, what creates muscle growth. I was like a [填空10]. I’ve been told I wouldn’t be able to bench press more than 400 pounds—my ass.

  • 暂无选项

What can be inferred from the conversation?

  • The patient has already gone on a diet.
  • The patient didn't pay enough attention to his health.
  • The patient has a lot of free time.
  • The patient is a businessman.

How about the patient’s heart?

  • Unhealthy
  • Weak
  • Healthy
  • Strong

Which of the following is the doctor's advice?

  • To do more exercise.
  • Not to walk stairs.
  • To reduce smoking.
  • To join a boxing club.

What can be inferred from the conversation?

  • The patient is very optimistic.
  • The patient's office is on the fourth floor.
  • The patient is a very busy person.
  • The patient is a lazy person.

Which of the following is true according to the conversation?

  • The doctor gives the patient many drugs.
  • The doctor gives the patient a prescription.
  • The diet and exercise program will do little good to the patient.
  • The patient quit smoking the year before.

\(已知曲面S:x^2+y^2+z^2=2ax,则\int\int_{S}(x^2+y^2+z^2)ds=(\,)\)

  • \[2\pi a^4\]
  • \[4\pi a^4\]
  • \[6\pi a^4\]
  • \[8\pi a^4\]

\(已知曲面S:y+z=5,则\int\int_{S}(x+y+z)ds=(\,)\)

  • \[125\sqrt{2}\pi\]
  • \[125\sqrt{3}\pi\]
  • \[124\sqrt{2}\pi\]
  • \[124\sqrt{3}\pi\]

\(已知曲面C是圆柱面x^2+y^2=1,平面z=x+2及z=0所围成的空间立体的表面.\\则\int\int_{C}xds=(\,)\)

  • \[\frac{1}{2}\pi\]
  • \[\pi\]
  • \[2\pi\]
  • \[3\pi\]

\(已知曲面\Sigma为球面z=\sqrt{a^2-x^2-y^2}位于平面z=h(0
  • \[\pi a(a^2-h^2)\]
  • \[\pi a(h^2-a^2)\]
  • \[2\pi a(a^2-h^2)\]
  • \[2\pi a(h^2-a^2)\]

【单选题】羟基蒽醌对Mg(Ac)2呈蓝-蓝紫色的是()A. 1,8-二羟基蒽醌 B. 1,4-二羟基蒽醌 C. 1,2-二羟基蒽醌 D. 1,6,8-三羟基蒽醌

\(已知曲面\Sigma:x^2+y^2+z^2=a^2,则\int\int_{\Sigma}x^2ds=(\,)\)

  • \[\frac{2}{3}\pi a^4\]
  • \[\frac{1}{3}\pi a^4\]
  • \[\pi a^4\]
  • \[\frac{4}{3}\pi a^4\]

\(已知曲面\Sigma:x^2+y^2+z^2=a^2被平面z=h(0
  • \[2\pi a \ln\frac{a}{h}\]
  • \[3\pi a \ln\frac{a}{h}\]
  • \[4\pi a \ln\frac{a}{h}\]
  • \[\pi a \ln\frac{a}{h}\]

\(已知曲面\Sigma是由平面x+y+z=1与坐标面所围成的四面体的表面.则\int\int_{\Sigma}xyzds=(\,)\)

  • \[\frac{\sqrt{3}}{120}\]
  • \[\frac{\sqrt{2}}{120}\]
  • \[\frac{\sqrt{3}}{150}\]
  • \[\frac{\sqrt{2}}{150}\]

\(已知\Sigma 是球面x^2+y^2+z^2=2(x+y+z).则\int\int_{\Sigma}(x^2+y^2)ds=(\,)\)

  • \[12\pi\]
  • \[24\pi\]
  • \[36\pi\]
  • \[48\pi\]

\(设\Sigma为锥面z=\sqrt{x^2+y^2}在柱体x^2+y^2\le 2x 内的部分,求曲面积分\int\int_{\Sigma}zds=(\,)\)

  • \[\frac{32}{9}\sqrt{3}\]
  • \[\frac{32}{9}\sqrt{2}\]
  • \[\frac{32}{3}\sqrt{2}\]
  • \[\frac{32}{3}\sqrt{3}\]

The major cause of a decrease in global fisheries since 1990 is due to

  • acid deposition.
  • overfishing.
  • increase in fuel prices.
  • increases in aquaculture.
  • decline in demand.

Which of the following would be the best way to slow the loss of biodiversity in the natural world?

  • freezing fertilized eggs in case the wild population becomes extinct
  • protecting small plots of land in each type of biome
  • create large preserves in the recognized hotspots
  • requiring a natural seed bank
  • creating corridors across every country

Which worldview sees humans as separate from nature?

  • environmental wisdom
  • stewardship worldview
  • planetary management
  • environmental ignorance

Which is not one of the Four Scientific Principles of Sustainability?

  • biodiversity
  • reliance on solar energy
  • affluenza
  • nutrient cycling
  • population control

Which of the following would not be considered a common resource?

  • the atmosphere
  • fish in the ocean
  • fossil fuels
  • soil
  • water in streams and rivers

Which of the following is an example of the Tragedy of the Commons?

  • managing a common grazing land between a group of ranchers
  • depletion of an aquifer by farmers in Africa irrigating crops
  • converting your homes electricity to wind energy based electricity
  • consolidating all nuclear wastes at one site
  • poaching of endangered mountain lions

Finding a solution to a current environmental problem isn’t always easy because

  • there is only one correct answer to environmental problems.
  • it means people will suffer.
  • once a solution is suggested it can never be changed.
  • laws must always be written to solve the environmental problem.
  • any solution has both advantages and disadvantages.

Environmental degradation occurs when

  • excess nutrients from fertilizers caused O2 depletion.
  • fossil fuel reserves are depleted.
  • strip mining increases erosion.
  • nuclear waste leaches into groundwater.
  • All of the above

【单选题】羟基蒽醌对Mg(Ac)2呈蓝-蓝紫色的是()A. 1,8-二羟基蒽醌 B. 1,4-二羟基蒽醌 C. 1,2-二羟基蒽醌 D. 1,6,8-三羟基蒽醌

One of the primary causes of many current environmental issues is

  • the sustainable use of resources.
  • increasing human population.
  • uneven distribution of wealth.
  • both b and c
  • all of the above

Which of the following has made the biggest overall impact on environmental degradation?

  • lack of recycling
  • increase in personal vehicle use
  • logging
  • increased human population
  • ecotourism

Which of the following is the GREATEST threat to a species becoming extinct?

  • decreasing legislation
  • bush meat and black market trade
  • increasing habitat loss
  • recreational fishing
  • use for scientific experiments

Texans value bluebonnets because they are beautiful. This is an example of _____ importance.

  • economic
  • ecological
  • medical
  • aesthetic
  • human health

Which of the following is not part of the Clean Air Act?

  • hazardous or toxic air pollutants
  • acid rain
  • ozone-depleting greenhouse gases
  • regional haze and smog
  • high heat index

Who wrote A Sand County Almanac?

  • Teddy Roosevelt
  • Aldo Leopold
  • Rachel Carson
  • John Glenn
  • John Muir

What decade do we consider the beginning of the environmental movement in the U.S.?

  • 50’s
  • 60’s
  • 70’s
  • 80’s
  • 90’s

While global population is still increasing, most current estimates show a decrease in growth rate in the past decade. However, scientists are still worried about the environmental impact of the population because

  • AIDs continues to lower life expectancy in Africa.
  • fertility is decreasing due to environmental factors.
  • life expectancy in developed nations is increasing, which strains the economy of that nation.
  • an increased standard of living in many developing countries has led to dramatically increased resource use.
  • deprivation and suffering in developing nations is high due to poor standards of living.

The human population has undergone a dramatic increase in the past century. Which of the below factors are the major reasons for the increase?

  • modern medicine and the Industrial Revolution
  • decreased warfare and increased birth control
  • increased education for women and decreased warfare
  • new agriculture methods and new pesticides
  • use of new food crops and increased immigration

A state highway was constructed over a wetland ecosystem. The state received a permit to fill in the existing wetlands in accordance with the provisions of the _____ of 1972, and agreed to create another wetland. This trade-off is referred to as _____.

  • Clean Water Act, mitigation
  • Clean Water Act, remediation
  • Clean Water Act, restoration
  • Endangered Species Act, mitigation
  • Endangered Species Act, remediation

Which of the following actions would improve the quality of the worldwide environment?

  • discovery of new resources of fossil fuels in coastal areas
  • increased life expectancy in developed nations
  • reduction/stabilization of the human population
  • increased agriculture on marginal desert lands
  • increased food from ocean ecosystems

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