(2017年)已知某线声源长度为l0,在线声源垂直平分线上距线声源r0和r处的声级分别为Lp(r0)和Lp(r),根据《环境影响评价技术导则声环境》,当r
A.L p (r)=L p (r 0 )-10lg(r/r 0 ) B.L p (r)=L p (r 0 )-201g(r/r 0 ) C.L p (r)=L p (r 0 )-10lg(r 0 /r) D.L p (r)=L p (r 0 )-201g(r 0 /r)正确答案A
(2017年)已知某线声源长度为l0,在线声源垂直平分线上距线声源r0和r处的声级分别为Lp(r0)和Lp(r),根据《环境影响评价技术导则声环境》,当r
A.L p (r)=L p (r 0 )-10lg(r/r 0 ) B.L p (r)=L p (r 0 )-201g(r/r 0 ) C.L p (r)=L p (r 0 )-10lg(r 0 /r) D.L p (r)=L p (r 0 )-201g(r 0 /r)正确答案A