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单选题
()means the curve on the earth’s surface which cuts all the meridians at the same angle.
A

Great Circle

B

Position Line

C

Rhumb line

D

True Bearing


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考题 共用题干 Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.According to the passage,"weight"should be understood in the sense thatA:it is fixed if it is outside the earth's gravitational puliB:it decreases four times when it is 4,000 miles from the earth's centerC:it varies with the change of the gravitational attraction between two objectsD:things increase in amount as they are closer to the earth's surface

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考题 共用题干 Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.We find it hard to break free from ideas connected with living on the earth because______.A:it demands too great an effort for us to do soB:we are too familiar with the way things are to question the ideasC:we have proved that those ideas are correctD:we are so sure of ourselves that we never doubt anything on the earth

考题 共用题干 Weight on and off the Earth We are so used to.our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.Because we can feel that things are heavy,we think of "weight"as being a fixed quality in an object,but it is not really fixed at all.If you could take a one-pound packet of butter 4,000 miles out from the earth,it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space?The reason is this:all objects have a natural attraction for all other objects;this is called gravitational attraction.But this power of attraction between two obects gets weaker as they get farther apart.When the butter was at the surface of the earth,it was 4,000 miles from the center.When we took the butter 4,000 miles out,it was 8,000 miles from the center,which is twice the distance.If you double the distance between two objects,their gravitational attraction decreases two times two.If you treble the distance, it gets nine times weaker(three times three)and so on. So this is one of the first things we need to remember that the weight of an object in space is not the same as its weight on the surface of the earth. What about the weight of our pound of butter on the surface of the moon?At the distance the puii of the earth is about 4,000 times smaller than it is here on the surface,so we can forget all about the earth-pull on our butter. On the other hand,on the moon there will be an attraction between the butter and the moon,but the butter will weigh only about one-sixth as much as it does on the earth.This is because the moon is so much smaller than the earth.The amount of gravitational pull that a body produces depends on the amount of material in it.A packet of butter has a gravitational pull of its own;but this is very small in relation to the pull of something as large as the moon,or the earth,or the sun.The main idea of this passage isA:different weight systems in different placesB:freedom from traditional ideasC:traveling from the earth to the moonD:the effect of gravitation on weight

考题 The power saving state in which a computer cuts power to all its unneeded parts and copies the RAM content to the hard drive is called()A、hibernateB、shutdownC、sleepD、hypervisor

考题 单选题Which statement about the gyrocompass is FALSE().A Its accuracy remains the same at all latitudesB It seeks the true meridianC It can be used near the Earth's magnetic polesD If an error exists,it is the same on all headings

考题 单选题A plane that cuts the Earth’s surface and passes through the poles will always form().A the equatorB a loxodromic curveC a small circleD a meridian

考题 单选题A plane perpendicular to the polar axis will never form what line on the Earth’s surface? ()A Great circleB EquatorC Small circleD Meridian

考题 单选题The equator is().A the primary great circle of the Earth perpendicular to the axisB the line to which all celestial observations are reducedC the line from which a celestial body's altitude is measuredD All of the above

考题 单选题According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT: _____.A absorbing radiation at visible wavelengthsB absorbing infrared radiationC absorbing outgoing radiation from the EarthD helping to retain heat near the Earth’s surface

考题 单选题The direction of the surface wind is().A directly from high pressure toward low pressureB directly from low pressure toward high pressureC from high pressure toward low pressure deflected by the earth's rotationD from low pressure toward high pressure deflected by the earth's rotation

考题 单选题Only a small part of the sun’s energy reaches the earth’ s surface because most of it is ______.A absorbed by the clouds in the lower atmosphereB reflected by the gases in the upper atmosphereC lost in the upper and lower atmosphereD used to evaporate water from the oceans and lakes

考题 单选题Without the sun’s light _____ the earth’s surface, it would be so cold that life could not exist on the earth.A warmsB warmedC warmingD to warm

考题 单选题What is the basic principle of the magnetic compass().A Magnetic materials of the same polarity repel each other and those of opposite polarity attractB The Earth's magnetic lines of force are parallel to the surface of the EarthC Magnetic meridians connect points of equal magnetic variationD The compass needle(s)will,when properly compensated,lie parallel to the isogonic lines of the Earth

考题 单选题_____ most of the earth's surface is covered by water, fresh water is very rare and precious.A AsB OnceC IfD Although

考题 单选题A plane that cuts the Earth’s surface at any angle and passes through the center will always form().A the equatorB a great circleC a small circleD a meridian

考题 单选题The points on the earth’s surface where the magnetic dip is 90° are().A Along the magnetic equatorB Connected by the isoclinal lineC The isoporsD The magnetic poles