题目

The aims of the Illustrators’(插图画家的)Exhibition, staged as part of the Bologna Children’s Book Fair, organized by BolognaFiere and held from 23to 26 December 2011,are to bring illustrators and publishers together and to promote illustrators and their works among publishers.QUALIFICATIONS •Individual illustrators or groups of illustrators of any nationality, if they were born before 31st December 1992, whose artwork is intended for use in children’s books, are qualified to enter the Exhibition, either directly or through publishing houses or schools. •Please state in 关于滑动摩擦力，下列说法正确的是（ ）A. 物体在支持面上的滑动速度越大，滑动摩擦力也一定越大；B. 滑动摩擦力的方向一定与物体相对支持面的滑动方向相反；C. 接触面的动摩擦因数越大，滑动摩擦力也越大；D. 滑动摩擦力的方向一定与物体运动方向相反。