α |
β |
α |
β |
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|
a |
b |
a |
b |
π |
4 |
π |
2 |
a |
b |
b |
a |
n |
2 |
a |
b |
a |
b |
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|
|
| ||||
|
|
|
| ||
|
|
b |
a |
| ||||
|
|
| ||||
|
|
|
| ||
|
|
a |
b |
b |
a |
n |
2 |
a |
b |
n1 |
2 |
b |
a |
n2 |
2 |
a |
b |
b |
a |
n1n2 |
4 |
π |
4 |
π |
2 |
a |
b |
n1 |
2 |
1 |
2 |
1 |
2 |
a |
b |
a |
b |
a |
b |
a |
b |
A.30° | B.45° | C.60° | D.90° |
a |
b |
a |
b |
A.90° | B.30° | C.60° | D.150° |
m |
n |
m |
n |
m |
n |
a |
m |
n |
b |
m |
n |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.等于30° | B.等于45° | C.等于60° | D.不确定 |
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