a |
3 |
b |
1 |
2 |
| ||
2 |
a |
c |
x |
a |
b |
y |
a |
b |
x |
y |
c |
|
|
|
c |
| ||
2 |
1 |
2 |
| ||
2 |
1 |
2 |
a |
b |
a |
b |
x |
y |
a |
b |
1 |
4 |
3 |
t |
| ||
2 |
3 |
t |
| ||
2 |
2 |
AB |
c |
BC |
a |
AC |
b |
a |
b |
b |
c |
a |
c |
x2 |
a2 |
y2 |
b2 |
1 |
2 |
6 |
OA |
OB |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
c |
a |
b |
c |
a |
b |
a |
b |
a |
c |
b |
c |
a |
b |
A.3个 | B.2个 | C.1个 | D.0个 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
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