问题:填空题工件以平面定位时,可选用()和()等定位元件。...
Tuesday, March 12, 2024
Thursday, September 22, 2022
Thursday, September 15, 2022
问题:单选题数控机床进给系统采用齿轮传动副时,为了提高传动精度应该有消除()措施。A 齿轮轴向间隙B 齿顶间隙C 齿侧间隙D 齿根间隙...
Friday, March 17, 2023
问题:当脉冲放电能量相同时,热导率愈小的金属,电蚀量会降低。...
Thursday, September 22, 2022
问题:单选题正弦电压最大值为Um,当频率增大原有频率的10倍时,该电压有效值()A 增大10倍B 减小到1/10C 不变...
Tuesday, April 2, 2024
问题:基准孔的上偏差大于零,基准轴的下偏差的绝对值等于其尺寸公差。...
Thursday, September 22, 2022
问题:从减小伺服驱动系统的外形尺寸和提高可靠性的角度来看,采用直流伺服驱动比交流伺服驱动更合理。...
Thursday, September 22, 2022
Thursday, September 22, 2022
Tuesday, September 20, 2022
Thursday, September 22, 2022
问题:在测量薄片工件的硬度时,常用的硬度测试方法的表示符号是()。...
Tuesday, September 20, 2022
Wednesday, September 14, 2022
问题:8086输出周期中必须提供高电平“1”的控制信号是()...
Sunday, September 18, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Wednesday, September 21, 2022
问题:砂型铸造中常用的手工造型方法有()、()、()和活块造型等。...
Thursday, September 22, 2022
问题:火硬度不足和软点一类的质量问题,可在返修前进行一次退火、正火或高温回火以消除淬火应力,防止重新淬火时发生过量变形或开裂。...
Thursday, September 22, 2022
问题:判断题数控车床的进给方式分每分钟进给和每转进给两种,一般可用G94和G95来区分。A 对B 错...
Monday, April 29, 2024