a |
b |
a |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
a |
1 |
2 |
1 |
3 |
a |
b |
(2
|
4
|
4-4×1×6×
|
7 |
1 |
3 |
7 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.
| B.2
| C.1 | D.2 |
a |
b |
a |
b |
m |
m |
a |
m |
b |
m |
A.1 | B.
| C.
| D.
|
a |
b |
a |
b |
a |
b |
c |
a |
b |
a |
c |
A.
| B.1 | C.
| D.
|
a |
x |
2 |
y | ||
|
b |
x |
2 |
y | ||
|
a |
b |
A.1 | B.2 | C.5 | D.1或5 |
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