?

???1?2???




??
1???????
2???????2 cm2?
3?5%1%?
4???????50??
5?????
6??????????????
7???1 cm2??
8???50cm2??
9???30%??
10???34?????
11?????????
12???100 cm2?
13??????????
14????
15????????
16??0.5??0.8?
17??0.8?
18????????
19???1/3??
20?????
21?????????
22???????????
23??
24???
25???
26????
27?????
28??26 dB?56 dB?
29?????????
30?????
31???
32???1?2??
33??????????
34???
35??? ?
36???
37?????
38?????
39??
40???
41???
42????
43???
44???
45???
46???
...