a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.
| B.
| C.
| D.
|
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
a |
b |
a |
b |
b |
a |
b |
a |
b |
| ||||
|
|
1 |
2×1 |
1 |
2 |
a |
b |
a |
b |
π |
3 |
a |
3 |
b |
a |
b |
a |
a |
b |
A.30° | B.60° | C.120° | D.150° |
a |
a |
b |
A.[0,
| B.[0,
| C.(0,
| D.[
|
a |
b |
a |
b |
c |
a |
b |
a |
c |
a |
b |
A.1:2 | B.2:
| C.2:1 | D.
|
a |
b |
a |
b |
a |
b |
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