Although the environment is very quiet, but the decibel value is not less than 30dbA. Why?
Tonny12138 2024-07-11 04:48:53 52 Views0 Replies Although the environment is very quiet, but the decibel value is not less than 30dbA. Why?
2024-07-11 04:48:53 In our living environment, there is always a little sound . Human's ear is hard to hear the sound below 30dBA, but the equipment still can detect the sound. So it is difficult for the sound level to be less than 30dBA in our living environment. Tonny12138
Tonny12138 
