问题:在车床研磨外圆柱面时,当出现与轴线小于450交叉网纹时,说明研磨环的往复运动速度()。A、太快B、太慢C、太快或太慢D、适中...
Sunday, September 24, 2023
问题:合金工具钢中的合金元素的主要作用是提高钢的淬透性、()和热硬性。...
Wednesday, July 12, 2023
Sunday, September 11, 2022
Saturday, September 10, 2022
Saturday, September 10, 2022
问题:锻件由数个简单几何体构成时,几何体间的交接处不应形成()。...
Sunday, July 16, 2023
问题:酸性焊条的氧化性强,焊接时合金元素烧损较大,焊缝的力学性能较差,...
Sunday, September 11, 2022
Saturday, September 10, 2022
Sunday, September 11, 2022
Saturday, September 10, 2022
Sunday, September 11, 2022
问题:快速成型技术分为液相成型、薄层材料成型法和()三类。...
Thursday, May 25, 2023
Tuesday, January 31, 2023
Sunday, September 11, 2022
Saturday, September 10, 2022
Thursday, May 11, 2023
问题:直线尺寸链采用概率算法时,若各组成环均接近正太分布,则封闭环的公...
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:应用卧式测长仪进行内尺寸测量属于()测量,需使用标准环规做测量基...
Sunday, September 11, 2022
Sunday, April 2, 2023