A. 60鍒呜礉鐩稿綋浜庢坠链洪煶閲忕殑澶氩皯
60鍒呜礉鐩稿綋浜庢坠链洪煶閲忕殑绾50%銆
鍒呜礉锛坉ecibel锛/'dɛsɪ.bɛl/锛夋槸閲忓害涓や釜鐩稿悓鍗曚綅涔嬫暟閲忔瘆渚嬬殑璁￠噺鍗曚綅锛屼富瑕佺敤浜庡害閲忓０阔冲己搴︼纴甯哥敤dB琛ㄧず銆
钬滃垎钬濓纸deci-锛夋寚鍗佸垎涔嬩竴锛屼釜浣嶆槸钬滆礉钬濓纸bel锛夛纴涓鑸鍙閲囩敤鍒呜礉銆傚垎璐濇槸浠ョ编锲藉彂鏄庡朵筜铡嗗北澶路镙奸浄铡勫喡疯礉灏旓纸Alexander Graham Bell锛夌殑钖嶅瓧锻藉悕镄勚
鍒呜礉鏄锲藉堕夊畾镄勯潪锲介檯鍗曚綅鍒跺崟浣, 鏄鎴戝浗娉曞畾璁￠噺鍗曚綅涓镄勭骇宸鍗曚綅锛岃〃绀轰负dB锛屽叾瀹氢箟涓猴细钬滀袱涓钖岀被锷熺巼閲忔垨鍙涓庡姛鐜囩被姣旂殑閲忎箣姣斿肩殑甯哥敤瀵规暟涔树互10绛変簬1镞剁殑绾у樊钬 銆 钖屾椂锛 鍦ㄤ腑鍗庝汉姘戝叡鍜屽浗娉曞畾鍗曚綅镄勮ˉ鍏呰存槑涓瀵光滃彲涓庡姛鐜囩被姣旂殑閲忊 锷犱互浜呜存槑锛气 阃氩父鏄鎸囩数娴佸钩鏂广佺数铡嫔钩鏂广佽川镣归熷害骞虫柟銆佸０铡嫔钩鏂广佷綅绉诲钩鏂广侀熷害骞虫柟銆佸姞阃熷钩鏂广佸姏骞虫柟銆佹尟骞呭钩鏂广佸満寮哄拰澹拌兘瀵嗗害绛夆 銆