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
Tuesday, September 13, 2022
Tuesday, September 13, 2022
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: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:塑料模的顶杆应()A、与型面齐平B、高出型面0.05~0.1mmC、高出型面0.1~0.5mmD、低于型面0.05~0.1mmE、低于型面0.05~0.1mm...
Thursday, October 6, 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: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
Wednesday, December 20, 2023
Tuesday, September 13, 2022
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
Tuesday, September 13, 2022
问题:电火花加工中若能合理利用覆盖效应则有助于降低电极的损耗。...
Tuesday, September 13, 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:对于淬火和非淬火相关件孔系的加工常采用()加工。...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:10、15、20、25等低碳结构钢的加工性能较好,但用做成型零部...
Tuesday, September 13, 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