a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.30° | B.60° | C.120° | D.150° |
a |
b |
a |
b |
a |
a |
b |
b |
a |
b |
a |
b |
a |
b |
a |
b |
1 |
2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.0 | B.-1 | C.0或-1 | D.-1或1 |
OA |
OB |
3 |
OA |
OB |
π |
6 |
OC |
OA |
OB |
λ |
μ |
A.
| B.
| C.3 | D.
|
π |
2 |
PM |
PN |
a |
b |
c |
0 |
a |
c |
b |
3 |
a |
a |
b |
A.
| B.
| C.-
| D.-
|
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