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提问人：网友jannylee 发布时间：2022-01-06

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Several loudspeakers are _______ from the ceiling and we can hear the speaker very clearly

A.connected

B.sustained

C.associated

D.suspended

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更多“Several loudspeakers are _______ from the ceiling and we can hear the speaker very clearly”相关的问题

第1题

SECTION BPASSAGESDirections: In this section, you will hear several passages. Listen to th

SECTION B PASSAGES

Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

听力原文： Propaganda media are categorized by methods of dissemination: face-to-face (interpersonal), audiovisual, audio, and visual.

Face-to-face (interpersonal) communication is the most effective means of transmitting a persuasive message. It is employed in rallies, rumor campaigns, group discussions, lectures, show-and-tell demonstrations, social organizations, social activities, entertainment, and individual person-to-person contact, all providing a participating experience for the individual or group to recall later.

Audiovisual media such as television, electronic tape recordings, and sound motion pictures are the second most effective means of communication available to the psychological operator. Effectiveness is based on seeing and hearing the persuasive message. These media are an excellent means of transmitting persuasive messages and eliciting a high degree of recall.

Audio media (loudspeakers and radio) lend themselves to the transmission of brief, simple messages and to personalization by use of the human voice. They require little or no effort by the audience, and generally, they have more appeal than visual media. Also, the barrier of illiteracy may be more easily overcome with audio media than with visual media (printed material).

Visual media can transmit long, complex material. Animated or still cartoons may be used to convey themes to illiterate and preliterate target audiences. Visual media generally have the least amount of popular appeal.

Themes are reinforced and the target audience given broad coverage by using several media to deliver the same basic message. For example, radio and television can augment leaflets; face-to-face communication can support newspaper circulation.

The most effective means of communication is employed in all of the following forms EXCEPT______.

A．ralli1es

B．group discussion

C．rumor campaigns

D．psychological operation

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第2题

To fight a noise by making more noise sounds strange ,but that's exactly what motor engine

ers are doing in Germany and some other countries.

Car makers' research and development laboratories have already proved that mixing more noise with the help of loudspeakers can reduce the unwanted noise.

Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency(频率) mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore ,by producing a perfect copy of the noise and delaying it by half a wave cycle(周期), we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems(系统)both inside and outside the cars.

Another good thing about the use of noise-killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better.

Some engineers believe that the noise-killing system will be used in most cars within a few years. But the carmakers haven't decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.

Which of the following gives a general idea of how the noise-killing system works？

A．By producing pressure waves going in the opposite direction.

B．By mixing high frequency sound waves with low frequency sound waves.

C．By mixing new sound waves with the noise and sending them out together.

D．By making copies of the unwanted sound waves and letting them out a little later.

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第3题

听力原文：The idea of fighting a noise by making more noise sounds strange, but that's exac

听力原文： The idea of fighting a noise by making more noise sounds strange, but that's exactly what motor engineers are doing in Germany and some other countries.

Carmaker's research and development laboratories have already proved that mixing in more noise with the help of loudspeakers can reduce the unwanted noise.

Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency mix so that the highest point of one wave happens at the same time with the lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of the noise and delaying it by half a wave cycle, we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems both inside and outside the cars.

Another good thing about the use of noise-killing systems is that it saves the need for a silencer, which not only reduces the weight of a car, but also makes the motor burn less oil and work better.

Some engineers believe that the noise-killing system will be used in most cars in 1996. But the carmakers haven't decided if they will put it into production because it would add several hundred dollars to the cost of their cars.

(30)

A．By mixing high frequency sound waves with low frequency sound waves.

B．By producing pressure waves going in the opposite direction.

C．By mixing new sound waves with the noise and sending them out together.

D．By making copies of the unwanted sound waves and letting them out a little later.

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第4题

D To fight a noise by making more noise sounds strange, but that ' s exactly what motor e

To fight a noise by making more noise sounds strange, but that ' s exactly what motor engi-

neers are doing in Germany and some other countries.

Carmaker ' s research and development laboratories have already proved that mixing more noise

with the help of loudspeakers can reduce the unwanted noise. Physicists have known about the tech-

nique for a long time. Sound is made up of pressure waves in the air. If two sound waves' of the

same frequency(频率） mix so that the highest point of one wave happens at the same time as the'

lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of

the noise and delaying it by half a wave cycle(周期) ,we can kill the unwanted noise. Using this

technique many carmakers are racing to develop noise killing systems(系统) borh inside and outside

the cars.

Another good thing about the use of noise killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor bum less fuel and work better. Sorpe engineers believe that the noise killing system will be used in most cars within a few

years. But the carmakers haven' t decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.

69. Which of the following gives a general idea of how the noise killing system works？

[ A]By producing pressure waves going in the opposite direction.

[ B ] By mixing high frequency sound waves with .low frequency sound waves.

[C]By mixing new sound waves with the noise and sending them out together.

[D]By making copies of the unwanted sound waves and letting them out a little later.

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第5题

What facilities are used for conference？

A、projection screens

B、loudspeakers

C、floodlights

D、projector

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第6题

He quickened and ______ his walking pace as he heard the announcement in the loudspeakers

that the train would leave in ten minutes.

A．prolonged

B．lengthened

C．extended

D．stretched

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第7题

56 Loudspeakers were fixed in the hall so that everyone__ an opportunity to hear the speec

A ought to have B must have C may have D should have

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第8题

PUBLIC ADDRESS SYSTEM:LOUDSPEAKERS IN THE VESSEL’S CABINS, MESS ROOMS, ETC., AND ON DECK V

IA WHICH IMPORTANT INFORMATION CAN BE BROADCAST FROM A CENTRAL POINT, MOSTLY FROM THE NAVIGATION BRIDGE defines ______.

A.AA-system

B.PP-system

C.PA-system

D.AP-system

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第9题

Sensor （e.g., microphone) a device that detects/measures a signal or stimulus acquires inf

Sensor (e.g., microphone) a device that detects/measures a signal or stimulus acquires information from the “real world”. Actuator (e.g., loudspeakers) a device that generates a signal or stimulus. Transducer a device that converts a primary form of energy into a corresponding signal with a different energy form.

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第10题

To give the forest a sense of realness, all the following are used EXCEPT that ______.A．hi

To give the forest a sense of realness, all the following are used EXCEPT that ______.

A．hidden loudspeakers are used to produce forest sound

B．a huge video screen is put up on the back wall

C．special equipment is employed to produce forest smells

D．the forest is surrounded by front and back walls

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