e1 |
e2 |
π |
3 |
b1 |
e1 |
e2 |
b2 |
e1 |
e2 |
b1 |
b2 |
e1 |
e2 |
π |
3 |
e1 |
e2 |
1 |
2 |
b1 |
b2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
a |
c |
a |
a |
c |
a |
a |
c |
OA |
OB |
OM |
PA |
PB |
OP |
OA |
OP |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
e |
e |
a |
e |
e |
b |
e |
e |
A.30° | B.60° | C.120° | D.150° |
a |
b |
2 |
a |
b |
a |
a |
b |
A.30° | B.45° | C.60° | D.75° |
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