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Because the actual center of some planets may differ from the observed center,the navigator applies a correction known as the().
A . phase correction
B . refraction correction
C . semidiameter correction
D . augmentation correctio
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In the Northern Hemisphere,an observer at point II in the weather system should experience a wind shift from the().
A . Southwest,clockwise to northwest
B . Northeast,clockwise to west-southwest
C . Northeast,counterclockwise to northwest
D . East,counterclockwise to south-southwest
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A victim is coughing and wheezing from a partialobstruction of the airway. An observer should ().
A . perform the Heimlich maneuver
B . immediately start CPR
C . give back blows and something to drink
D . allow the person to continue coughing and dislodge the obstruction on his ow
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If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should()
A . check the air filter for obstruction
B . check for an exhaust leak
C . check the exhaust temperature
D . secure the engine
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A time diagram is a diagram of the celestial sphere as observed from above the().
A . south celestial pole
B . north celestial pole
C . observer's meridian
D . Greenwich meridia
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Lines drawn through points on the Earth having the same atmospheric pressure are known as ().
A . Isothermal
B . Millibars
C . Isobars
D . Seismic
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Lines drawn through points on the earth having the same atmospheric pressure are known as().
A . isothermal
B . millibars
C . isobars
D . seismic
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The best estimate of the wind direction at sea level can be obtained from observing the direction of the().
A . cloud movement
B . vessel heading
C . waves
D . swell
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On Pandora corporations from earth are mining a rare mineral that is the key to solving the energy crisis on Earth.
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The tortoise as far as I know has been on earth for thousands of years.
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Just as the soil is a part of the earth.______the atmosphere.
A.as it is
B.the same is
C.so is
D.and equally is
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______from the moon , our earth , with water_____seventy percent of its surface, appear as a "blue ball".
A.See , covered
B.Seeing , covering
C.Seen , covering
D.To see, to cover
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11、示波器应尽可能的亮,有利于观察。 The oscilloscope should be as bright as possible to facilitate observation.
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The earth ___the necessary amount of heat and light from the sun()
A.supplies
B.receives
C.provides
D.requires
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Earth has an atmosphere, which protects the surface from harmful rays.
A.minerals
B.substances
C.gases
D.beams
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(see)______from space, our earth, with water covering 70% of its surface, appears as a "bl
(see)______from space, our earth, with water covering 70% of its surface, appears as a "blue planet".
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The moon’s surface gravity is only about____as strong as the earth’s surface gravity.
A.one-six
B.one-sixth
C.six-one
D.one-sixst
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The 1 plates of the Earth are formed from _______.
A.the oceanic crusts and continental crusts
B.the crusts and the mantle
C.the crusts and the top and solid part of the mantle
D.the continental crusts and the solid part of the mantle
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The cause of the transition of the Earth's magnetic field comes from ___.
A.the movement deep inside the Earth
B.the periodically reverses of the Earth
C.the force coming from outer space
D.the mechanical movement of the Earth
此题为多项选择题。
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Viewed from a star in some other comer of the galaxy, Earth would be a speck, a faint blue dot hidden in the blazing light of our sun. While our neighbors Venus and Mars would reflect a fairly even glow, Earth would put on a little show. Earth's light would brighten and dim as it spins, because oceans, deserts, forests and clouds—which are all too small to be seen from such a distance-reflect varying amounts of sunlight. The variations, it turns out, are so strong and distinctive that surprising amount of information could be taken from a simple ebb and flow of light. Scientists at Princeton University and the Institute for Advanced Study conducted a detailed study of Earth's reflections as a way for human scientists to learn about distant planets that may be like our own.
(2) "If you looked at our solar system from far away, and you looked at the terrestrial planets--Mercury, Venus, Earth and Mars--one of the quickest ways to see that Earth is unique is by looking at the light curve," said Ed Turner, professor of astrophysics and a co-author of the study. "Earth has by far the most complicated light curve." The standard thinking in the field had been that most of the information about an Earth-like planet would come from spectral analysis, a static reading of the relative component of different colors within the light, rather than a reading of changes over time. Spectral analysis would reveal the presence of gases such as water vapor, carbon dioxide and oxygen, in the planet's atmosphere, looking at the change in light over time docs not replace spectral analysis, but it could greatly increase the amount of information scientists could learn, said Turner. It may indicate, for example, the presence of weather, oceans, ice or even plant life.
"Earth would put on a little show" means: as it spins, ______.
A.Earth is a more active planet than Venus and Mars
B.Earth reflects a brighter light curve than Venus and Mars
C.Earth shows oceans, deserts, forests and clouds, while Venus and Mars don't
D.Earth reflects sunlight in an ebb-and-flow manner
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Scientists have long believed one way to stop the Earth’s atmosphere from warming is by planting more trees. The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosphere. Carbon dioxide is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s atmosphere, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing carbon dioxide as had been thought.
The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen.
In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide.
The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere.
Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful.
Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants.
What is the purpose of this passage?
A.Introduce some new ideas about the relationship between trees and carbon dioxide.
B.Introduce recent condition of global industrial pollution.
C.Call on people to plant more trees to reduce greenhouse gases.
D.Point out that power companies should be responsible for the rising levels of carbon dioxide.
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He was considered as a in the feld of earth sience.()
A.boat
B. pioneer
C. delicious
D. price
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The expression As far as I know… suggests that people usually observe the Maxim of in their daily conversations()
A.Quantity
B.Quality
C.Relevance
D.Manner
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The spatial resolution of earth observation satellite images has been developed to the present highest_____resolution()
A.km level
B.100-meter
C.submeter
D.millimeter