A |
B |
C |
0 |
A.2 | B.
| C.3 | D.
|
OA |
OC |
OD, |
OB |
OC |
OE |
A |
B |
C |
0 |
OD |
OE |
0 |
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不充分又不必要条件 |
AP |
1 |
3 |
AB |
AC |
A.0<t<
| B.0<t<
| C.0<t<
| D.0<t<
|
AC |
AB |
AD |
A.ABCD为矩形 | B.ABCD是菱形 |
C.ABCD是正方形 | D.ABCD是平行四边形 |
PA |
PB |
PC |
0 |
PA |
PB |
PC |
A.
| B.
| C.
| D.
|
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