分贝

• A db referred to one milliwatt
  毫瓦分贝
• Calculation of pn db
  感受噪声分贝计算
• As you all know , the normal noise threshold for private housing is 55 decibels
  正如你们知道的，个人房子正常噪音为55分贝。
• Decibel abbr . db ; d
  分贝音强单位
• Bill packs these mikes - make sure you keep that needle below 90 . right , vlad
  比尔负责这些麦克风.确定保持在90分贝下,对吧,维拉
• Db ; ab decibel
  分贝音强单位
• But most portable music players can produce sounds up to one hundred twenty decibels
  而很多携带式音乐播放器产生的声音就高达120分贝。
• The ratio measures from an absolute silence of 0db to the launch of a rocket of 200db
  比例由完全无声的0分贝至火箭发射声音的200分贝。
• At 95 decibels reaction times to tasks that involve decision making plummeted by 20 %
  噪音达到95分贝时，作出判断的反应次数锐减了20 % 。
• But most portable music players can produce sounds up to one hundred twenty decibels
  但是大部分便携式音乐播放器的音量都可达到120分贝。