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acoustic impedance
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对象数据库系统不具有(51)的优点。A．可维护性好B．能有效地表达客观世界和查询信息C．解决了关系数据库运行中的一个典型问题，即应用程序语言与数据库管理系统对数据类型支持不一致的问题，即通常所说的“阻抗不匹配”(Impedance Mismatch)问题。D．面向对象的技术非常容易掌握
考题
B320touch机型,在多点触控上采用的是哪种技术()
A.Touch Smart技术B.SAW（Surface Acoustic Wave）技术C.Media Mirror Media Mirror技术D.TouchSmartPro技术
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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.
C.walls of an auditorium.
D.the design of an auditorium.
考题
The word "acoustic" in the last paragraph has something to do with_____A.performance.
B.sound.
C.audience.
D.weather.
考题
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_____
A.sound waves and their effects.
B.the types of music orchestras play.
C.walls of an auditorium.
D.the design of an auditorium.
考题
Which of the following would be the impedance of an 8 ohm and a 4 ohm speaker that are wired in parallel？（）A、2.66 ohmsB、Less than 1 ohmC、4 ohmsD、12 ohms
考题
Your customer has converted from traditional servers to BladeCenter technology and has a requirement for an RSA adapter on a new BladeCenter server. Which of the following options would you use？ （）A、Remote Supervisor Adapter II （RSA II Slimline）B、Management Module， which comes standard on the BladeCenterC、Acoustic Attenuation ModuleD、Ethernet NICs
考题
B320touch机型，在多点触控上采用的是哪种技术（）A、Touch Smart技术B、SAW（Surface Acoustic Wave）技术C、Media Mirror Media Mirror技术D、TouchSmartPro技术
考题
Which of the following is the primary purpose of impedance matched volume control？（）A、Maintains proper speaker phaseB、Protects the amplifier from damageC、Protects the digital systems from damageD、Amplifies the speaker signal
考题
单选题Which of the following would be the impedance of an 8 ohm and a 4 ohm speaker that are wired in parallel？（）A
2.66 ohmsB
Less than 1 ohmC
4 ohmsD
12 ohms
考题
单选题Operational amplifiers, used primarily in analog circuits, are characterized by（）A
high input impedance, high gain and low output impedanceB
high input impedance, high gain and high output impedanceC
low input impedance, low gain and high output impedanceD
low input impedance, high gain and low output impedance
考题
单选题Construction of a new automobile parts manufacturing facility has recently been completed. Thefacility IT manager wants to deploy voice over WLAN. During your initial walkthrough， you observenumerous highly reflective surfaces on the manufacturing equipment and in the buildingconstruction itself. What potential problem exists that should be accounted for during your sitesurvey？（）A
LOS modulationB
Multipath distortionC
RF signal absorptionD
RF signal attenuationE
Fresnel zone impedance
考题
填空题（）是组成语言的声音，是（）（Acoustic）和（）（Language）的组合体。
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