Busy street 的声源级 约80dB（分贝）

来源: 于 2018-11-21 10:04:47 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
  • From 80 to 90 dB we are getting closer to the danger zone, but the risks are limited to very long exposures.