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单选题
The shortest distance between any two points on earth defines a（）.
A
small circle
B
great circle
C
rhumb line
D
hyperbola
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更多 “单选题The shortest distance between any two points on earth defines a（）.A small circleB great circleC rhumb lineD hyperbola” 相关考题
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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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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.How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth?A:1 pound. B:2 pounds. C:3 pounds. D:4 pounds.
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共用题干
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单选题An ammeter should be used to measure （）A
the voltage between two points in a circuitB
circuit continuityC
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单选题Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.A
always be nearer to the equatorB
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单选题Which of the following statements best describes Flashback Versions Query？（）A
Flashback Versions Query is used to make changes to multiple versions of data that existed between two points in time.B
Flashback Versions Query is used to view all version changes on rows that existed between the time the query was executed and a point in time in the past.C
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单选题The distance between the two NAVTEX stations with the same B1 character should be not exceed（）nautical miles.A
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单选题When we say that two objects have relative motion, we mean （）.A
the distance between them remains the sameB
the distance between them is changingC
the position between them is not changingD
their positions to the earth remain the same
考题
单选题The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.A
difference in longitudeB
mid-longitudeC
departureD
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单选题The distance between any two meridians measured along a parallel of latitude （）.A
increases in north latitude and decreases in south latitudeB
decreases as DLO increasesC
increases with increased latitudeD
decreases with increased latitude
考题
单选题What defines a great circle? （）A
A curved line drawn on a Mercator ChartB
A course line that inscribes a loxodromic curveC
The shortest distance between any two points on the earthD
The smallest circle that can be drawn on the face of a sphere
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单选题Others argue that since the earth has endured a long string of ice ages in the last two million to three million years, any warming is（）to be temporary.A
seemedB
likelyC
tendedD
possible
考题
单选题In which voyage, between two points, is the rhumb line distance not approximately the same as the great circle distance?（）.A
The two points are in low latitudes in the same hemisphereB
The two points are in high latitudes in the same hemisphereC
The two points are near the equator, but in different hemispheresD
One point is near the equator, one point is in a high latitude, and both are near the 180th meridian
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问答题Two men, starting at the same point, walk in opposite directions for 4 meters, turn left and walk another 3 meters. What is the distance between them?
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单选题From the text we learn that the laser can ______.A
cut a structure from a right positionB
design parts of a complex structureC
measure the distance between planetsD
predict the movement of earth’s plates
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单选题_____ is reported in the newspapers that the talks between the two companies have not made any progress.A
ThatB
WhatC
ItD
As
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