冲模在工作所受的合力作用点若与冲床滑块的中心线相生命,该合力作用点称为()。 发布时间:2021-03-30 03:01 │ 来源:www.tikuol.com 题型:填空题 问题: 冲模在工作所受的合力作用点若与冲床滑块的中心线相生命,该合力作用点称为()。
题型:填空题 His efforts to raise money for his program were ________ because no one showed any intention to take a cent out of their pockets. [ ]A. in place B. in sightC. in effect D. in vain 查看答案