Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:闭式软齿面齿轮传动中,齿轮最可能出现的破坏形式为()。A、轮齿折断B、齿面磨料磨损C、齿面疲劳占蚀...
Wednesday, December 20, 2023
问题:拉深模试冲时,由于拉深间隙过大,使拉深件高度不够,应()...
Tuesday, September 13, 2022
问题:内径百分表采用的是()测量法。A、间接B、比较C、直接...
Friday, September 23, 2022
问题:为了防止推杆变形、卡死或断裂,推杆和推管推出机构中需设置()机构...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:塑料料具有以下()等优良的特性。A、密度小、质量轻、比强度高、比刚度高B、绝缘性能好,介电耗低C、耐磨、减振、自润滑性能好、化学稳定性高D、前面三个答案全对...
Tuesday, June 13, 2023
问题:若塑件在两股熔料熔接处牢度不够,可采用()的方法解决。...
Friday, September 16, 2022
问题:()使车刀锋利,切削轻快。A、增大前角B、减小前角C、减小后角D、增大刃倾角...
Thursday, November 30, 2023
问题:毛坯断面上的应力由外层的拉应力过渡到内层的压应力,中间必然有一层...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Thursday, September 29, 2022
问题:三板式注射模模架一般用于(),以满足浇道脱模的需要。...
Tuesday, September 13, 2022
问题:聚酰胺PA-66为结晶性塑料,有明显的熔点,其熔点通常在()℃。...
Friday, September 16, 2022
Wednesday, December 20, 2023
问题:凸模较大,一般需要加垫板;凸模较小,一般不需要加垫板。...
Friday, September 16, 2022
问题:以中碳钢为例,积屑瘤高度最大的切削速度为()A、10m/minB、20m/minC、70~130m/minD、140m/min...
Friday, September 1, 2023
Tuesday, September 13, 2022