D
C
B
C
A
67 dB
C
A
68 dB
C
C
B
B
C
C
E
F
B
B
72 dB
C
F
C
C
C
C
C
C
C
C
C
C
B
B
C
B
D
67 dB
B
C
C
C
72 dB
C
B
70 dB