欢迎来到牛牛题库网 牛牛题库官网
logo
搜索

单项选择题

历史性城市使用价值的内涵不包括：
A、经济价值
B、文化价值
C、社会价值
D、政治价值

点击查看答案&解析

相关考题

单项选择题
  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)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 walls reflect sound back and forth, creating a rapid, repetitive pulsing effect. Large pillars and comers 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. A. Less pressure on the job markets. B. More benefits for the nursing home. C. Less pressure on the environment. D. More freedom for the elderly people.
多项选择题
对于搜索引擎中图片的检索结果，一般来说可以做哪些条件筛选？
A、图片尺寸
B、图片的使用权限
C、图片的色彩
D、图片的风格
单项选择题
一离心泵之吸入口压力为50mmHg(真空度)排放口压力为250mmHg(表压)，则其出口压力高于入口压力 （          ）。
A．200mmHg
B．1060mmHg
C．300mmHg
D．550mmHg
微信小程序免费搜题

All Rights Reserved 版权所有©牛牛题库网(nntiku.com)

备案号：湘ICP备2022003000号-1

微信扫一扫,加关注免费搜题

微信扫一扫,加关注免费搜题