线段在平面内，则直线与平面的位置关系是

     A．                        B．

     C．由线段的长短而定            D．以上都不对

A.3x－2y＋2=0                                                B.2x＋3y＋7=0

C.3x－2y－12=0                                              D.2x＋3y＋8=0

A.x=-             B.x=             C.x=              D.x=-

A.(-6,8)                       B.(-8,-6)

C.(6,8)                        D.(-6,-8)

A.y=3x-10         B.y=3x-18            C.y=3x+4               D.y=4x+3