รถไฟชั้น 3 ตอนวิ่งเข้าอุโมงค์ เสียงดังถึง 115dB ซึ่งอยู่ในระดับอันตราย
decibelpro.app/blog/how-many-d…
At How Many Decibels Does A Human Speak Normally
Wondering at how many decibels does a human speak normally? In this article, we're looking into the average decibel level of human speech. Read on to find out everything you need to know about this topic.Alex Savchuk (Decibel Meter App | Best Digital Sound Level Meter For Your Smartphone)
Cameron Bosch
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