3、过直线 _(1):dfrac (x-1)(1)=dfrac (y-2)(0)=dfrac (z-3)(-1) 且平行于直-|||-线 _(2):dfrac (x+2)(2)=dfrac (y-1)(1)=dfrac (z)(1) 的平面方程为 ()-|||-(A) x-2y+2z+4=0 ;-|||-(B) x-2y+z+2=0 :-|||-(C) x-3y+z+2=0 ;