PA |
PB |
PC |
A.-1 | B.1 | C.
| D.-
|
PB |
PC |
PD |
PA |
PB |
PC |
PA |
PD |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
PA |
PB |
PC |
1 |
2 |
2 |
2 |
8 |
3 |
OA |
OB |
OM |
CM |
y |
x |
A.
| B.
| C.
| D.
|
x2 |
2 |
OA |
OB |
2 |
3 |
OA |
OB |
2 |
3 |
3 |
4 |
a |
b |
c |
a |
b |
c |
0 |
a |
b |
a |
b |
c |
A.1 | B.
| C.2 | D.
|
a |
b |
a |
b |
A.互相平行 | B.互相垂直 | C.夹角为30° | D.夹角为60° |
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