Friday, September 16, 2022
当轴的端面对基准轴线有垂直度要求时,可以用全跳动公差来控制。...
Saturday, September 17, 2022
Friday, September 16, 2022
Friday, September 16, 2022
GPS静态定位之所以需要观测较长时间,其主要目的是为了正确确定整...
Friday, September 16, 2022
Saturday, September 17, 2022
Saturday, September 17, 2022
Saturday, September 17, 2022
在普通螺纹国标中,对内螺纹规定了()两种公差位置;对外螺纹规定了...
Saturday, September 17, 2022
20世纪50年代末期,美国开始研制多普勒卫星定位技术进行测速、定...
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Saturday, September 17, 2022
Friday, September 16, 2022
Saturday, September 17, 2022
用高次差的方法进行整周跳变的修复中,对于稳定性为10-10的接收...
Friday, September 16, 2022
在机器装配过程或零件加工过程中,由()的尺寸形成的封闭尺寸组,称...
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Friday, September 16, 2022
Friday, September 16, 2022
Saturday, September 17, 2022
Friday, September 16, 2022
在用GPS信号传递时间时,存在着哪三种时间尺度(时标)?Q...
Friday, September 16, 2022