optical projection pantograph是什么意思

用法例句

The application of geometric projection method to the illustration of roundness in optical measuring projector;

投影变换方法在光学测量投影仪系统圆度表示中的应用

A digital optical projector is used as the optical source,and the electrical grating is generated by computer.

实验系统光源采用数字光学投影仪,并用计算机生成电子光栅。