3 |
A.
| B.
| C.
| D.
|
3 |
| ||
3 |
| ||
3 |
3 |
| ||
3 |
| ||
3 |
π |
6 |
A.∀θ∈[0,π),∃α∈R使得直线ax+y+1=0的倾斜角为θ |
B.曲线C:ax2+by2=c表示双曲线的充要条件是ab<0 |
C.到两定点(-2,4),(4,-4)距离和为12的点的轨迹是椭圆 |
D.到两定点(-2,0),(2,0)距离差的绝对值为4的点的轨迹是双曲线 |
A.
| B.-
| C.
| D.-
|
A.
| B.-
| C.
| D.-
|
A.45° | B.60° | C.120° | D.135° |
A.[0,π) | B.[0,
| C.[0,
| D.[0,
|
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