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