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提问人：网友songziqing
发布时间：2022-01-06
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The number of poles of the loop transfer function at the origin is called the type number.
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更多“The number of poles of the loop transfer function at the origin is called the type number.”相关的问题
第1题
On the root locus plot, the number of separate loci is equal to the number of poles of .
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On the root locus plot, the number of separate loci is equal to the number of poles of.
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.
第2题
The number of poles of the forward path transfer function at the origin is called the type number.
第3题
On a highway there is an electric pole every 96 feet. If the poles are numbered consecutiv
ely, what is the number of the pole 2 miles past pole number 56？ (1 mile=5, 280 feet)
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A．109
B．110
C．152
D．165
E．166
第4题
The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequenc
y 50HzYou can infer that the number of magnetic poles is .
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A.2
B.4
C.6
D.8
第5题
A highly controversial explanation proposed by string theorists is that ______.A．magnetic
A highly controversial explanation proposed by string theorists is that ______.
A．magnetic fields affect gravity subtly
B．G is larger near the Earth's poles
C．G has a number of hidden dimensions
D．discrepancies emerge between measures of G
第6题
DThere are an extremely large number of ants worldwide. Each individual （个体的） ant hard
D
There are an extremely large number of ants worldwide. Each individual （个体的） ant hardly weigh anything， but put together they weigh roughly the same as all of mankind． They also live nearly everywhere， except on frozen mountain tops and around the poles. For animals their size， ants have been astonishingly successful， largely due to their wonderful social behavior.
In colonies （群体） that range in size from a few hundred to tens of millions， they organize their lives with a clear division of labor. Even more amazing is how they achieve this level of organization. Where we use sound and sight to communicate， ants depend primarily on pheromone （外激素）， chemicals sent out by individuals and smelled or tasted by fellow members of their colony. When an ant finds food， it produces a pheromone that will lead others straight to where the food is. When an individual ant comes under attack or is dying， it sends out an alarm pheromone to warn the colony to prepare for a conflict as a defense unit.
In fact， when it comes to the art of war， ants have no equal. They are completely fearless and will readily take on a creature much larger than themselves， attacking in large groups and overcoming their target. Such is their devotion to the common good of the colony that not only soldier ants but also worker ants will sacrifice their lives to help defeat an enemy.
Behaving in this selfless and devoted manner， these little creatures have survived on Earth， for more than 140 million years， far longer than dinosaurs. Because they think as one， they have a collective （集体的） intelligence greater than you would expect from its individual parts.
根据材料回答68-71题。 We can learn from the passage that ants are ____________.
A.not willing to share food
B.not found around the poles
C.more successful than all other animals
D.too many to achieve any level of organization
第7题
Telegraph poles must be set in the ground so that they are vertical.
A、straight
B、level with the ground
C、motionless
D、upright
第8题
Section BDirections: There are 2 passages in this section. Each passage is followed by som
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
As countless photos from space can prove, the Earth is round the "Blue Marble," as astronauts have affectionately dubbed it. Appearances, however, can be deceiving. Planet Earth is not, in fact, perfectly round. This is not to say the Earth is flat. Well before Columbus sailed the ocean, Aristotle and other ancient Greek scholars proposed that Earth was round. This was based on a number of observations, such as the fact that departing ships seemed to be smaller as they sailed away, as one might expect if sailing across a ball says scientist Bill Carstensen of Virginia Tech in Blacksburg.
Isaac Newton first proposed that Earth was not perfectly round. Instead, he suggested it was an oblate spheroid(扁球体) a sphere that is squashed at its poles and swollen at the equator. He was correct and, because of this bulge, the distance from Earth's center to sea level is roughly 21 kilometers greater at the equator than at the poles.
Our globe, however, is not even a perfect oblate spheroid, because mass is not distributed evenly within the planet. The greater a concentration of mass is, the stronger its gravitational(重力的) pull, "creating bumps around the globe," says scientist Joe Meert at the University of Florida. Also Earth's shape changes over time due to a number of other dynamic factors. Mass shifts around inside the planet. Mountains and valleys emerge and disappear due to plate construction. Occasionally falling stars make the surface cave in. And the gravitational pull of the moon and sun not only cause ocean tides but earth titles as well. In addition, the changing weight of the oceans and atmosphere can cause the crust to be out of shape.
Moreover, to even out Earth's distribution of mass and stabilize its spin, "the entire surface of the Earth will rotate and try to redistribute mass along the equator, a process called true polar wander", Meert says.
To keep track of Earth's shape, scientists now position thousands of Global Positioning System receivers on the ground that can detect changes in their rising of a few millimeters, Meert says. Another method, dubbed satellite laser ranging, fires visible-wavelength lasers from a few dozen ground stations at satellites. Any changes detected in their orbits correspond to gravitational pulls and thus mass distributions inside the planet. It may not take much technology to understand that Earth is not perfectly round, but it takes quite a bit of effort and technology related above to determine its true shape.
Which of the following statements is true according to the first paragraph？
A．A number of photos from space show us that the earth is not round.
B．People think the earth is fiat, since its appearance deceived people.
C．Aristotle denied that the earth is flat, basing on the fact that Columbus sailed the ocean.
D．Tile fact that ships appeared smaller when they sailed away showed the earth is round.
第9题
"Popular art" has a number of meanings, impossible to define with any precision which rang
e from folklore to junk. The poles are clear enough, but the middle tends to blur. The Hollywood Western 0fthe 1930' s, for example, has elements of folklore, but is closer to junk than to high art or folk art. There can be great trash, just as there is bad high art. The musicals of George Gershwin are great popular art, never aspiring to high art. Schubert and Brahms, however, used elements of popular music --folk themes --in works clearly intended as high art. The case of Verdi is a different one: he took a popular genre --bourgeois melodrama set to music (an accurate definition of nineteenth-century opera) --and, without altering its fundamental nature, transmuted it into high art. This remains one of the greatest achievements in music, and one that cannot be fully appreciated without recognizing the essential trashiness of the genre.
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As an example of such a transmutation, consider what Verdi made of the typical political elements of nineteenth-century opera. Generally in the plots of these operas, a hero or heroine usually portrayed only as an individual, unfettered by class -- is caught between the immoral corruption of the aristocracy and the doctrinaire rigidity or secret greed of the leaders of the proletariat. Verdi transforms this naive and unlikely formulation with music of extraordinary energy and rhythmic vitality, music more subtle than it seems at first hearing. There are scenes and arias that still sound like calls to arms and were clearly understood as such when they were first performed. Such pieces lend an immediacy to the other- wise veiled political message of these operas and call up feelings beyond those of the opera itself.
Or consider Verdi' s treatment of character. Before Verdi, there were rarely any characters at all in musical drama, only a series of situations which allowed the singers to express a series of emotional states. Any attempt to find coherent psychological portrayal in these operas is misplaced ingenuity. The only coherence was the singer'' s vocal technique: when the cast changed, new arias were almost always substituted, generally adapted from other operas. Verdi' s characters, on the other hand, have genuine consistency and integrity, even if, in many cases, the consistency is that of paste- board melodrama. The integrity of the character is achieved through the music once he had become established, Verdi did not rewrite his music for different singers or countenance alterations or substitutions of somebody else' s arias in one of his operas, as every eighteenth century composer had done. When he revised an opera It was only for dramatic economy and effectiveness.
The author used the example of The Hollywood Western of the 1930' s in order to______ .
A．what is folklore
B．what is junk
C．transition from folklore to junk
D．the ambiguity of the two poles of popular art
第10题
The root locus always starts at the zeros and ends at the poles of 
The root locus always starts at the zeros and ends at the poles of
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