a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
a |
b |
a |
b |
b |
a |
a |
b |
b |
a |
4 |
5 |
4 |
5 |
AB |
BC |
A.-13 | B.9 | C.-9 | D.13 |
a |
b |
c |
a |
b |
d |
a |
b |
c |
d |
A.k=1且c与d同向 | B.k=1且c与d反向 |
C.k=-1且c与d同向 | D.k=-1且c与d反向 |
AP |
1 |
3 |
PB |
a |
1 |
3 |
b |
3 |
2 |
a |
b |
A.
| B.
| C.
| D.
|
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