题目

Are you running a restaurant but can’t afford to hire waiters? Well, you could learn from this Japanese restaurant that hires monkeys for the job. In order to make them look more human, the restaurant owner even masks(用面具遮掩) their faces. The restaurant is Kayabuki, which a traditional Japanese restaurant. They have hired a couple of monkeys named Yat-chan and Fuku-chan to work as waiters (or waitresses, we’re not sure). 16-year-old Yat-chan is the older of the two, but he moves quickly between tables as he takes the customers’ drink orders. Fuku-chan gives customers a h如图所示，在高度不同的两水平台阶上放有质量分别为、的两物体，物体间用轻弹簧相连，弹簧与竖直方向夹角为。在左端施加水平拉力，使、均处于静止状态。已知m1表面光滑，重力加速度为，则下列说法正确的是( )A. 弹簧可能处于原长状态B. 弹簧弹力的大小为C. 地面对的摩擦力大小为D. 地面对的支持力可能为零