如图所示,M、N为平行金属板,分别带电+Q和-Q,带电小球用绝缘丝线悬挂在两金属板之间,平衡时丝线与M板夹角为θ,现将丝线突然剪断,带电小球在两板间(未与板接触之前)的运动将是: A.平抛运动 B.匀速直线运动C.自由落体运动 D.匀加速直线运动 答案:D9. (2015 .广安中考) —It's difficult for me the homework in such a short time.—Come on!Tm sure you can. A. finished B. to finish C. will finish D. finishes