a |
b |
1 |
2 |
1 |
2 |
A.|
| B.<
| C.
| D.
|
b |
1 |
2 |
1 |
2 |
|b| |
(
|
| ||
2 |
a |
b |
| ||||
|
| ||||
1×
|
| ||
2 |
a |
b |
a |
b |
π |
4 |
a |
b |
1 |
2 |
3 |
2 |
b |
1 |
2 |
1 |
2 |
a |
b |
b |
a |
b |
b |
a |
b |
1 |
2 |
1 |
2 |
b |
a |
b |
a |
b |
b |
BC |
a |
CA |
b |
a |
b |
A.-
| B.
| C.-
| D.
|
OA |
3 |
OB |
π |
2 |
AB |
13 |
A0A2 |
A0An |
AB |
AD |
AB |
CD |
A.相切 | B.相交 |
C.相离 | D.随α,β的值而定 |
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