AB |
a |
AC |
b |
AA1 |
c |
a |
b |
c |
MN |
MN |
MA1 |
A1B1 |
B1N |
1 |
3 |
BA1 |
AB |
1 |
3 |
B1C1 |
1 |
3 |
c |
a |
a |
1 |
3 |
b |
a |
1 |
3 |
a |
1 |
3 |
b |
1 |
3 |
c |
a |
b |
c |
a |
b |
c |
a |
b |
b |
c |
a |
c |
1 |
2 |
1 |
2 |
a |
b |
c |
5 |
MN |
1 |
3 |
a |
b |
c |
| ||
3 |
a |
b |
a |
b |
A.1 | B.
| C.-
| D.-1或1 |
OB |
A.(3,4,0) | B.2
| C.5 | D.
|
a |
b |
a |
b |
u |
v |
A.90° | B.60° | C.45° | D.30° |
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