B
B
C
A
C
A
71 dB
C
A
C
A
71 dB
C
A
71 dB
C
A
73 dB
C
A
C
A
C
A
71 dB
C
A
71 dB
C
A
71 dB
C
A
C
A
C
A
C
A
71 dB
C
A
71 dB
C
A
71 dB
C
A
D
D
72 dB