a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
a |
b |
6 |
a |
b |
a |
a |
b |
a |
a |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
a |
b |
a |
b |
a |
b |
a |
b |
. |
a |
. |
b |
A.-2或1 | B.-2或-1 | C.2或1 | D.2或-1 |
a |
b |
a |
b |
a |
b |
a |
b |
A.|
| B.|
| C.|
| D.|
|
a |
b |
a |
b |
A.1 | B.±1 | C.0 | D.-1 |
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