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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???????????
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24???
25???
26?...

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?? 1.???????? 2.?? ????????????????????,0.4?0.5?0.25?????????????? 3.?? ????????????????????0.53%??????????? 4.? ??????????????????????????23?1520? 5.??? ??????????????????????????????? 6. ???????????????????????????????? 7.???????CEAD ??? 1.?? 0.5%??1?????????1030%??57%20%?????????????????23?45?1??...