e1 |
e2 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
A.t>-1 且t≠1 | B.t>-1 | C.t<1 且t≠-1 | D.t<1 |
e1 |
e2 |
e1 |
e2 |
1 |
2 |
a |
b |
a |
b |
a |
b |
1+t |
2 |
a |
b |
c |
5 |
a |
b |
c |
5 |
2 |
a |
c |
A.30° | B.60° | C.120° | D.150° |
OB |
OC |
CA |
2 |
2 |
OA |
OB |
A.[
| B.[
| C.[
| D.[
|
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
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