a |
b |
a |
a |
•b |
b |
b |
1 |
2 |
15 |
4 |
1 |
2 |
15 |
4 |
15 |
4 |
15 |
4 |
2 |
AB |
AF |
2 |
AE |
BF |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
c |
b |
c |
A.(1)(3) | B.(2)(4) | C.(1)(4) | D.以上都不对 |
a |
b |
c |
a |
b |
c |
0 |
a |
b |
c |
a |
b |
b |
c |
c |
a |
A.-5 | B.5 | C.-13 | D.13 |
a |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
AB |
AC |
AB |
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