Busy street 的声源级 约80dB(分贝)

来源: gweipwu 2018-11-21 10:04:47 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读: 次 (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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