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名词解释题
消声sound attenuation;moise reduction sound deadening
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B.be cures for sound problems.
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Can you hear This?
When something creates a sound wave in a room or an auditorium, listeners hear the sound wave directly from the source. They also hear the reflections as the sound bounces off the walls, floor, and ceiling. These are called the reflected wave or reverberant(反射的)sound, which can be heard even after the sound is no longer coming from the source.
The reverberation time of an auditorium is determined by the volume or interior size of the auditorium. It is also determined by how well or how poorly the walls, ceiling, floor, and contents of the room (including the people) absorb sound. There is no ideal reverberation time. Because each use of an auditorium calls for different reverberation. Speech needs to be understood clearly: therefore rooms used for talking must have a short reverberation time. The full-sound performance of music such as Wagner operas or Mahler symphonies should have a long reverberation time. The light, rapid musical passages of Bach or Mozart need a reverberation time somewhere between.
Acoustic problems often are caused by poor auditorium design. Smooth, curved reflecting surfaces create large reflections. Parallel(平行的)walls reflect sound back and forth, creating a rapid, repetitive pulsing effect. Large pillars(柱)and corners can cause acoustic shadows as the sound waves try to pass around the object. Some of these problems can be solved by using absorbers and reflectors to change the reverberation time of a room. For example, hanging large reflectors, called clouds, over the performers will allow some sound frequencies to reflect and others to pass to achieve a pleasing mixture of sound.
文章(41~45)
This passage is mainly about_____A.sound waves and their effects.
B.the types of music orchestras play.
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D.the design of an auditorium.
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大学生利用课余时间打工
the future of press
Can you hear This?
When something creates a sound wave in a room or an auditorium, listeners hear the sound wave directly from the source. They also hear the reflections as the sound bounces off the walls, floor, and ceiling. These are called the reflected wave or reverberant(反射的)sound, which can be heard even after the sound is no longer coming from the source.
The reverberation time of an auditorium is determined by the volume or interior size of the auditorium. It is also determined by how well or how poorly the walls, ceiling, floor, and contents of the room (including the people) absorb sound. There is no ideal reverberation time. Because each use of an auditorium calls for different reverberation. Speech needs to be understood clearly: therefore rooms used for talking must have a short reverberation time. The full-sound performance of music such as Wagner operas or Mahler symphonies should have a long reverberation time. The light, rapid musical passages of Bach or Mozart need a reverberation time somewhere between.
Acoustic problems often are caused by poor auditorium design. Smooth, curved reflecting surfaces create large reflections. Parallel(平行的)walls reflect sound back and forth, creating a rapid, repetitive pulsing effect. Large pillars(柱)and corners can cause acoustic shadows as the sound waves try to pass around the object. Some of these problems can be solved by using absorbers and reflectors to change the reverberation time of a room. For example, hanging large reflectors, called clouds, over the performers will allow some sound frequencies to reflect and others to pass to achieve a pleasing mixture of sound.
文章(1~5)
This passage is mainly about_____
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D.the design of an auditorium.
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B.phone
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where the source of a sound isB
how loud a sound isC
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what makes a sound
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单选题A sailing vessel is overtaking a power-driven vessel in a narrow channel,so as to pass on the power-driven vessel’s port side. The overtaken vessel will have to move to facilitate passage. The sailing vessel is the().A
stand-on vessel and would sound two short blastsB
give-way vessel and would sound no whistle signalC
stand-on vessel and would sound no whistle signalD
give-way vessel and would sound two prolonged blasts followed by two short blasts
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单选题You are the administrator of Company’s network. You have disabled the integrated sound card on your Windows 2000 Professional computer by removing a hardware jumper and install a new PCI sound card. You restart the computer but the sound card does not function correctly. You use Device Manager to view the hardware settings on the computer as shown in the Device Manager window. (Click the Exhibit button.) You want the PCI sound card to function properly. What should you do? ()A
Use System in Control Panel to uninstall the integrated sound card.B
Use Device Manager to change the IRQ for the new sound card to a different setting from the disabled integrated sound card.C
Move the sound card to a different PCI slot.D
Uninstall the integrated sound card and disable Plug and Play detection for the new device. E
Use Device Manager to update the drivers for the new soundcard.
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单选题A sailing vessel is overtaking a steam vessel in a fairway on International waters,so as to pass on the steam vessel’s port side. The sailing vessel is the().A
privileged vessel and would sound two short blastsB
burdened vessel and would sound two prolonged blasts followed by two short blastsC
burdened vessel and would sound no whistle signalD
privileged vessel and would sound no whistle signal
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单选题You are approaching another vessel and will pass starboard to starboard without danger if no course changes are made.You should().A
hold course and sound a two blast whistle signalB
hold course and sound no whistle signalC
change course to the right and sound one blastD
hold course and sound two prolonged and two short blasts
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How to Install the Windows Sound System Microphone.B
The Windows Sound System Microphone.C
Computer Hardware.
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the sound of plane engine travels slower than the planeB
the frequency of the sound altersC
the passage does not mention itD
the pressure decreased when the plane flies in the air
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单选题Which of the following can serve as the best title of this passage?A
The Prefix Mach.B
The Speed of Sound.C
The Frequency of Sound.D
The Intensity of Sound.
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