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