• 2021-04-14
    置于铅垂面内的均质正方形簿板重P=100kN,与地面间的摩擦因数fs=0.5,欲使薄板静止不动,则作用在A点的力F的最大值应为_________。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/4e71aed91df644edb666e50cabb1ae57.png