?????????????
1??????=12%(????????8—10%)?
2?????????=????/????X100%=20%;
3???????????????;
4?????????=1/5??????????=5mm;
5????????????????;
6??????????=1/4??????????=20mm;
7????????????????????10%?????15%;
8???????????=1/4?????=1/5??;
9?????????????????;
10?????????????????;
11???????????????;
12???????????????????????;
13?????????????????????????????
14??????????????????????????????????????