September 2018 1 26 Report
Taraf intensitas bnyi knalpot trbuka dri 10 speda motor identik yg dhidupkan serentak=70 dB.jika ada 100 speda motr identik dhipkan bersama-sama,tarf identitas bnyi knalpot yg terdngar adlh...tolon jawabnya yaaaa
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