m |
n |
m |
n |
m |
n |
a |
m |
n |
b |
m |
n |
a |
b |
m |
n |
m |
n |
m |
n |
m |
n |
m |
m |
n |
n |
m |
n |
m |
n |
a |
b |
m |
m |
n |
n |
a |
m |
m |
n |
n |
a |
b |
m |
m |
n |
n |
b |
a |
b |
| ||||
|
|
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 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
c |
a |
b |
5 |
b |
a |
b |
c |
a |
| ||
10 |
a |
c |
a |
c |
c |
AB |
AC |
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