A.A1A2+B1B2="0" | B.A1A2-B1B2=0 |
C.=-1 | D.=-1 |
A.-3 | B.2 |
C.-3或2 | D.3或-2 |
A.a<0或a>1 | B.0<a≤1 |
C.-1<a<- | D.a≤-1或a≥- |
A.与l重合的直线 |
B.过P1且与l垂直的直线 |
C.过P2且与l平行的直线 |
D.不过P2但与l平行的直线 |
A.0 | B. |
C.0或 | D.- |
A.k≤3 | B.k<0或k=3 |
C.k="3" | D.k≤0或k=3 |
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