B
B
C
B
C
B
75 dB
C
A
71 dB
C
B
75 dB
A
A
72 dB
A
A
B
B
75 dB
C
B
74 dB
B
A
A
B
C
B
74 dB
B
B
72 dB
C
A
71 dB
C
B
C
A
74 dB
B
C
A
A
B
74 dB
A
B
74 dB
C
B
C
B
72 dB
C
A
71 dB