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10.已知过点A(-2,m)和B(m,4)的直线与直线2x+y-1=0平行,则m的值为( )
(A)0 (B)-8 (C)2 (D)10
11从原点向圆 x2+y2-12y+27=0作两条切线,则该圆夹在两条切线间的劣弧长为( )
(A)π (B)2π (C)4π (D)6π
12 若直线按向量平移后与圆相切,则c的值为( )
A.8或-2 B.6或-4 C.4或-6 D.2或-8