a |
b |
a |
b |
a |
b |
a |
a |
a |
b |
A.
| B.
| C.1+
| D.2 |
a |
b |
a |
b |
a |
a |
a |
b |
a |
a |
b |
1 |
2 |
3 |
2 |
m |
n |
m |
n |
m |
n |
m |
m |
n |
A.
| B.
| C.2 | D.1+
|
AB |
AC |
AB |
AC |
A.-
| B.0或
| C.
| D.0或-
|
a |
b |
c |
0 |
a |
b |
c |
19 |
a |
b |
a |
b |
A.30° | B.45° | C.60° | D.以上都不对 |
A.30° | B.45° | C.60° | D.90° |
a |
b |
a |
b |
A.0° | B.45° | C.90° | D.180° |
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