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black cone（）
- A、黑柱体
- B、黑球体
- C、黑锥形体
- D、黑菱形体
参考答案
更多 “black cone（）A、黑柱体B、黑球体C、黑锥形体D、黑菱形体” 相关考题
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Do you know that gentleman ( )?
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Judging from this passage, people of the Middle Ages probably ______.A. treated black cats with respectB. treated black cats badlyC. were witches if they had black catsD. thought black cats were beautiful
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People of ancient Egypt and Europeans of the Middle Ages ______.A. both worshipped black catsB. both feared black catsC. thought black cats could bring good luckD. felt very different about black cats
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( ) is expert in ( ).
A、The Doctor Black/ surgeryB、Doctor Black/ the surgeryC、A Doctor Black/ the surgeryD、Doctor Black/ surgery
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Which of the following statements about Black English is untrue?
A Black English is an ethnic variety of the English language.B Black English is one of the official languages of America.C Black English has some vocabulary of its own.D Black English has a number of distinctive features in its phonological, morphological and syn-tactic systems.
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WhichofthefollowingisthecorrectwiringorderforanRJ－11twolinejack?()
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A vessel trawling would display______．A.a black ballB.a basketC.a double cone，point to pointD.none of the above
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In the daytime, you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows ______.A.a black ballB.a black coneC.two black conesD.a basket
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共用题干
Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The nearest black holes are hundreds of light years away from us.A:Right B:Wrong C:Not mentioned
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共用题干
Black Holes1 Black holes can be best described as a sort of vacuum,sucking up everything in space.Scientists have discovered that black holes come from an explosion of huge stars.Stars that are near death can no longer burn due to loss of fuel , and because its temperature can no longer control the gravitational（重力的）force,hydrogen ends up putting pressure onto the star's surface until it suddenly explodes then collapses.2 Black holes come from stars ihat are made of hydrogen,other gases and a few metals.When these explode it can turn into a stellar-mass（恒星质量) black hole , which can only occur if the star is large enough (should be bigger than the sun)for the explosion to break it into pieces,and the gravity starts to compact every piece into the tiniest particle.Try to see and compare:if a star that's ten times the size of the sun ends up being a black hole that's no longer than 70 kilometers,then the Earth would become a black hole that'S only a fraction of an inch!3 Objects that get sucked in a black hole will always remain there,never to break free.i1it remember that black holes can only gobble up（吞噬）objects within a specific distance to it.It's possible for a large star near the sun to become a black hole,but the sun will continue to stay in place.Orbits（轨道）do not change because the newly formed black hole contains exactly the same amount of mass as when it was a star, only this time its mass is totally contracted that it can end up as no bigger than a state.4 Sofar,astronomers have figured out that black holes exist because of Albert Einstcin's theory of relativity.In the end,through numerous studies,they have discovered that black holes truly exist.Since black holes trap light and do not give off light,it is nearly impossible to detect black holes via a telescope.But astronomers continue to study galaxies（银河系）, space and the solar system to understand how black holes might evolve.It is possible that black holes can exist for millions of years,and later contribute to a bigger process in galaxies,which can eventually lead to creation of new entities（实体）.Scientists also credit black holes as helpful in learning how galaxies began to form.Paragraph 1________A:What Happens to the Objects Around a Black Hole?B:Is There Proof That Black Holes Really Exist?C:How Were Black Holes Named?D:What Are Different Types of Black Holes?E:What Are Black Holes Made of? F: How Are Black Holes Formed?
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下列哪一项是css正确的语法构成（）。A、body：color=blackB、{body；color：black}C、body{color：black；}D、{body：color=black（body}
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What is the requirement of Remote Triggered Black Hole （RTBH ） filtering？（）A、IBGP updates exchange between trigger router and black hole routerB、EBGP updates exchange between trigger router and black hole routerC、OSPF updates exchange between trigger router and black hole routerD、ISIS updates exchange between trigger router and black hole router
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Which of the following is the correct wiring order for an RJ-11 two line jack？（）A、Black，Green，Red，YellowB、Black，Red，Green，YellowC、Red，Black，Green，YellowD、Yellow，Red，Green，Black
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单选题Jackie Robinson, the first Black American who was to play baseball in the majorleagues, joined the Brooklyn Dodgers in 1947.A
the first and a Black American whoB
was the first Black AmericanC
the first Black AmericanD
the Black American who first
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单选题下列选项CSS语法规则正确的是（）。A
body：color=blackB
{body；color：black}C
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{body：color=black（body）}
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单选题A vessel not under command shall display（）.A
two red lights at night and two black balls during daylightB
two red lights at night and three black balls during daylightC
three red lights at night and two black balls during daylightD
three red lights at night and three black balls during daylight
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单选题A power driven vessel when towing and the length of the tow exceeds 200 meters shall exhibit during daylight hours where they can best be seen which of the following shapes? （）A
a diamond shapeB
two cones，apexes togetherC
a black ballD
one cone，apex upward
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单选题We have some white and blue paint, but we （）.A
have black paintB
has black paintC
haven’t black paintD
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单选题A vessel engaged in fishing during the day would show（）.A
one black ballB
two cones with bases togetherC
a cone，apex downwardD
two cones，apexes together
考题
单选题During the day，a vessel with a tow over 200 meters in length will show（）.A
a black ballB
a diamond shapeC
two cones，apexes togetherD
one cone，apex upward
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单选题A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.A
A black ball in the forepart of her vesselB
A black double frustum of a coneC
A basket where best seenD
A black cone point upwards
考题
单选题Why did the boss send Mr. Black to China on business?A
Mr. Black had never been to China before.B
Mr. Black was an able and hard-working man.C
Mr. Black could buy something interesting for Tony.
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