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