i |
j |
a |
i |
j |
b |
i |
j |
a |
b |
1 |
2 |
1 |
2 |
a |
b |
a |
b |
a |
i |
j |
b |
i |
j |
a |
b |
i |
i |
j |
j |
i |
j |
a |
b |
1 |
2 |
a |
b |
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 |
m |
n |
a |
m |
n |
a |
m |
n |
A.120° | B.90° | C.60° | D.30° |
a |
b |
a |
b |
b |
a |
a |
i |
j |
a |
b |
i |
j |
a |
b |
i |
j |
a |
b |
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