2 |
3 |
1 |
2 |
1 |
2 |
2 |
2 |
1 |
2 |
1 |
2 |
90°π×12 |
360° |
π |
4 |
1 |
2 |
1 |
2 |
3 |
| ||
2 |
OA2-AF2 |
12-(
|
1 |
2 |
1 |
2 |
1 |
2 |
3 |
1 |
2 |
| ||
4 |
AB2-AD2 |
22-
|
60π×12 |
360 |
π |
6 |
1 |
2 |
π |
4 |
| ||
4 |
π |
6 |
2+
| ||
4 |
5π |
12 |
1 |
2 |
π |
4 |
| ||
4 |
π |
6 |
2-
| ||
4 |
π |
12 |
A.
| B.13寸 | C.25寸 | D.26寸 |
AB |
A.12cm | B.6cm | C.7cm | D.8cm |
4 |
5 |
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