在图4-120所示机构的D点上作用水平力P,图中AC=BC=EC=FC=DE=DF= 发布时间:2018-01-14 09:33 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在图4-120所示机构的D点上作用水平力P,图中AC=BC=EC=FC=DE=DF=L,为保持机构平衡,在滑块A处所作用的铅直力Q的大小是()。A.AB.BC.CD.D
题型:单项选择题 Usually John would be late for meetings. But this time, ____ to my surprise, he arrived on time. A little B. much C. ever D. even 查看答案