【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

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• 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.

• 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.

• 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)$ \(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.

• 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

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

• 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

• 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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