a |
b |
c |
a |
b |
c |
a |
b |
c |
A.2 | B.5 | C.2或5 | D.
|
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
a |
c |
b |
c |
a |
b |
a |
c |
b |
c |
a |
b |
c |
a |
b |
c |
A.6 | B.5 | C.4 | D.3 |
u |
v |
u |
v |
u |
v |
AB |
n |
n |
AC |
n |
BC |
A.0 | B.2 | C.-2 | D.-2或2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.23 | B.35 | C.
| D.
|
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