1
Q
A
2
Q
A
3
Q
A
4
Q
A
5
Q
A
6
Q
A
7
Q
A
a
8
Q
A
c
9
Q
A
b
10
Q
A
d
11
Q
A
12
Q
A
13
Q
A
14
Q
A
15
Q
A
16
Q
A
17
Q
A
18
Q
A
19
Q
A
20
Q
A
21
Q
A
22
Q
A
23
Q
A
24
Q
A
25
26
27
28
29
30
31
32
33
34
35
36
37
38
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83
- 3db
- 6db
84
one- tenth
logarithmic
85
False
c) 15mW / cm2
86
double
increase ten times
87
positive
positive
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
7. much less than
8. decibels (db)
9. In soft tissue, the attenuation coefficient in dB per centimeter is about 0.5 times the ultrasonic frequency in MHz
107
108
109
110
111
112
113
Cardiology
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Decks in class (6)
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