B
C
C
A
75 dB
C
A
D
A
75 dB
C
A
75 dB
B
C
C
A
C
E
C
A
75 dB
C
C
B
B
A
72 dB
C
A
D
A
75 dB
C
C
C
A
75 dB
D
A
75 dB
C
B
C
A
C
A
75 dB