a |
b |
a |
b |
π |
3 |
a |
c |
b |
c |
1 |
2 |
c |
A.[-
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1 |
2 |
a |
b |
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c |
b |
c |
a |
b |
a |
c |
c |
b |
c |
a |
b |
c |
1 |
2 |
c |
a |
c |
b |
c |
1 |
2 |
a |
b |
c |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
c |
a |
b |
c |
c |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
3 |
c |
3 |
AB |
AC |
A.
| B.
| C.
| D.与k有关 |
a |
b |
2 |
a |
a |
b |
a |
b |
a |
b |
c |
π |
6 |
a |
c |
π |
2 |
9π |
8 |
a |
b |
a |
3 |
b |
a |
b |
A.
| B.
| C.
| D.
|
a |
b |
a |
b |
a |
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