A flat metal plate for gauging the accuracy of a plane surface in precision metalworking.
A flat metal plate for gauging the accuracy of a plane surface in precision metalworking.
平面规，测平仪在精密金属加工中用于测定平面表面精度的金属平板
A flat metal plate for gauging the accuracy of a plane surface in precision metalworking.
平面规，测平仪在精密金属加工中用于测定平面表面精度的金属平板