a |
b |
3 |
c |
3 |
a |
c |
b |
b |
c |
A.
| B.
| C.
| D.
|
2a |
b |
3 |
c |
3 |
2a |
b |
c |
c |
2a |
b |
c |
a |
c |
b |
c |
a |
c |
b |
c |
b |
c |
b |
c |
b |
c |
4 |
4×2 |
1 |
2 |
π |
3 |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
A.30° | B.60° | C.120° | D.150° |
CB |
a |
CA |
b |
1 |
2 |
a |
b |
15
| ||
4 |
15 |
4 |
. |
a |
. |
b |
A.-
| B.
| C.
| D.
|
a |
π |
2 |
b |
a |
b |
A.θ-
| B.
| C.
| D.θ |
a |
b |
a |
b |
a |
b |
b |
a |
b |
A.30° | B.60° | C.120° | D.150° |
a |
b |
a |
b |
a |
b |
a |
b |
A.充分而不必要条件 | B.必要而不充分条件 |
C.充要条件 | D.既不充分又不必要条件 |
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