C
B
C
C
70 dB
C
A
71 dB
C
C
C
C
C
C
B
C
B
68 dB
C
C
68 dB
C
C
68 dB
C
C
68 dB
B
A
C
C
68 dB
C
B
68 dB
B
B
67 dB
C
A
71 dB
C
A
67 dB
D
C
69 dB
C
C
68 dB
C
C
C
C
68 dB