a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.
| B.
| C.
| D.
|
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
1 |
2 |
a |
1 |
2 |
b |
| ||||
|
|
1 |
2 |
2π |
3 |
a |
b |
a |
b |
a |
b |
a |
b |
A.60° | B.90° | C.120° | D.150° |
BC |
CA |
CA |
AB |
AB |
BC |
A.组成锐角三角形 | B.组成直角三角形 |
C.组成钝角三角形 | D.在同一条直线上 |
i |
j |
j |
i |
i |
i |
j |
A.
| B.
| C.
| D.
|
PA |
PB |
a |
b |
a |
a |
b |
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