名词解释题撞击声impact sound
名词解释题
撞击声impact sound
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Large pillars and corners may_____A.make sound rich and full.B.be cures for sound problems.C.be sources of sound problems.D.function as effectively as clouds.
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.C.walls of an auditorium.D.the design of an auditorium.
A ( ) is not a sound, it is a collection of distinctive phonetic features. A.phoneme B.phone C.sound D.speech
立即发警报。()A、Sound the bell immediately.B、Sound the alarm immediately.C、Ring the alarm immediately.D、Ring the bell immediately.
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单选题According to the last paragraph, it will be the most difficult for a person who has lost the hearing in one ear to tell ______.Awhere the source of a sound isBhow loud a sound isCwhen a sound starts to appearDwhat makes a sound
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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().Ahold course and sound a two blast whistle signalBhold course and sound no whistle signalCchange course to the right and sound one blastDhold course and sound two prolonged and two short blasts
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单选题Which of the following can serve as the best title of this passage?AThe Prefix Mach.BThe Speed of Sound.CThe Frequency of Sound.DThe Intensity of Sound.