<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/58f39ff73028478e96fde0df1080a8c9.jpg?x-oss-process=image/sharpen,200"/><br/> 滚子与凸轮之间从B点到C点接触过程中，凸轮转过的角度φ为多少，推杆的位移s是多少?