Busy street 的声源级 约80dB（分贝）

来源: gweipwu 于 2018-11-21 10:04:47 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (381 bytes)
  • From 80 to 90 dB we are getting closer to the danger zone, but the risks are limited to very long exposures.
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