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提问人：网友wisdom_sjb 发布时间：2022-01-06

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If the bat vibrates very little, ______.A．the fielder is unable to catch the soundB．the ba

If the bat vibrates very little, ______.

A．the fielder is unable to catch the sound

B．the ball will travel to a short distance

C．the ball may receive greater energy

D．the fielder should quickly run in

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更多“If the bat vibrates very little, ______.A．the fielder is unable to catch the soundB．the ba”相关的问题

第1题

If a centrifugal pump vibrates and is noisy when operating, the cause could be _____.A.wor

If a centrifugal pump vibrates and is noisy when operating, the cause could be _____.

A.worn gland sealing shaft

B.worn wearing rings

C.a bent shaft

D.reversed pump coupling

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第2题

Passage There s a time in every man s education when he arrives at the conviction that en

vy is ignorance; that imitation is suicide; that he must take himself for better, for worse, as his portion. . . Trust thyself; every heart vibrates to that iron string. Whoso would be a man must be a nonconformist. Questions:

This selection is selected from an essay. What is the title of that？

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第3题

A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is

found that the impeller is out of balanceWithout an available spare, you should _____.

A.drill holes through the heavy side of the impeller until it balances

B.weld counterweights to the light side of the impeller

C.remove metal from the heavy side by machining in a lathe

D.acid wash and serape the heavy side until it balances

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第4题

A tachometer is an instrument that uses resonance to determine ______.A．the speed of a mot

A tachometer is an instrument that uses resonance to determine ______.

A．the speed of a motor in revolutions

B．the frequency at which a motor vibrates

C．the amplitude of an engine that oscillates

D．the changes in a dial within a car engine

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第5题

As the arterial pressure vibrates at 80 - 120 mmHg, the renal blood flow does not change.

If you want to prove the hypothesis that this property of the renal blood flow is dependent on the autoregulation of the blood vessels, which kind of experimen you should performe？

A、acute and in vitro physiological experiment.

B、acute and in vivo physiological experiment.

C、cell culture

D、histological experiment

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第6题

听力原文：Objects that are vibrating make sounds．Rhythmic sound vibrations produce sound wa

听力原文： Objects that are vibrating make sounds．Rhythmic sound vibrations produce sound waves which travel in every direction．The frequency of a sound is the number of waves that pass a given point each second．The more rapidly an object vibrates，the greater the frequency of sound it makes．Frequency is measured in hertz．One hertz equals one sound wave per second．The frequency of sound determines the degree of highness or lowness of the sound．A high-pitched sound has a higher frequency than a low-pitched sound．Humans hear sounds that have frequencies from about 20 hertz to 20,000 hertz。Sound with a frequency higher than 20,000 hertz is called ultrasound which is too high-pitched for humans to hear．However，many animals can hear ultra- sound．Bats can hear higher sounds than any other animal．Some can hear up to 210,000 hertz．Bats send out lots of high-pitched squeaks and then listen to the echoes bouncing off things like insects．The shorter the time interval between the squeak and the echo，the closer they are to the insect．Using sound to find or“see” things is called echolocation．Another animal that uses ultrasound is the dolphin．Dolphins can hear sounds up to about 150,000 hertz．Dolphins use sound waves to find food underwater．They make clicking sounds that hit whatever is around them and then bounce hack to the dolphins．Dolphins can send as many as 2,000 clicks per second．Dolphins' ultrasound ability is so sensitive that they can detect small fish from 10 feet away．

(30)

A．The quicker it vibrates, the greater the frequency of sound it produces.

B．The slower it vibrates, the higher the frequency of sound it produces.

C．The quicker it vibrates, the lower the frequency of sound it produces.

D．The frequency of sound it produces is not in proportion to the speed it vibrates.

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第7题

听力原文： Objects that are vibrating make sounds. Rhythmic sound vibrations produce sound

waves which travel in every direction. The frequency of a sound is the number of waves that pass a given point each second. [29] The more rapid, an object vibrates, the greater the frequency of sound it makes. Frequency is measured in hertz. One hertz equals one sound wave per second. The frequency of sound determines the degree of highness or lowness of the sound. A high-pitched sound has a higher frequency than a low-pitched sound. [30] Humans hear sounds that have frequencies from about 20 hertz to 20,000 hertz. Sound with a frequency higher than 20,000 hertz is called ultrasound which is too high-pitched for humans to hear. However, many animals can hear ultra sound. Bats can hear higher sounds than any other animal. Some can hear up to 210,000 hertz. Bats send out lots of high-pitched squeaks and then listen to the echoes bouncing off things like insects. The shorter the time interval between the squeak and the echo, the closer they are to the insect. [31]Using sound to find or "see" things is called echolocation. Another animal that uses ultrasound is the dolphin. Dolphins can hear sounds up to about 150,000 hertz. Dolphins use sound waves to find food underwater. [31] They make clicking sounds that hit whatever is around them and then bounce back to the dolphins. Dolphins can send as many as 2,000 clicks per second. Dolphins' ultrasound ability is so sensitive that they can detect small fish from l0 feet away.

(30)

A．The quicker it vibrates, the greater the frequency of sound it produces.

B．The slower it vibrates, the higher the frequency of sound it produces.

C．The quicker it vibrates, the lower the frequency of sound it produces.

D．The frequency of sound it produces is not in proportion to the speed it vibrates.

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第8题

Is this argument deductive or inductive？ When I st...

Is this argument deductive or inductive？ When I stop at a traffic light, I hear this funny, rattling sound coming from under my car. It is sort of in the middle or maybe toward the back, but definitely not toward the front. I only hear it when the car is idling, not when I’m driving along at a reasonable speed. My Dad said once that the metal baffles (消音器隔板) inside a muffler (排气管消音器) can loosen up if the muffler is old and rusty. He said that a loose baffle makes a rattling sound when it vibrates, like when the engine is idling or when the tires are out of alignment. My muffler is at least nine years old. So, I’m thinking that probably the rattling sound is coming from the muffler.

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第9题

CenterPlugi安装的启动文件是（）。

A."startup、exe"

B."install、bat"

C."startup、bat"

D."shutdown、bat"

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第10题

把当前目录中所有扩展名为EXE文件换名为BAT文件，用（）命令

A.REN*.BAT*.EXE

B.REN？.BAT？.EXE

C.REN*.EXE*.BAT

D.REN？.EXE？.BAT

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