b |
0 |
b |
0 |
a |
b |
. |
a |
0 |
b |
0 |
a |
b |
a |
b |
a |
b |
a |
b |
. |
a |
. |
b |
a |
b |
. |
a |
. |
b |
A.0 | B.1 | C.2 | D.3 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
AB |
BD |
AC |
CD |
A.
| B.0 | C.
| D.
|
a |
a |
i |
j |
a |
i |
j |
b |
i |
j |
a |
b |
1 |
2 |
1 |
2 |
37 |
A.30° | B.45° | C.60° | D.90° |
A.一条线段 | B.一段圆弧 |
C.圆上一群孤立点 | D.一个单位圆 |
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