1·The image and material object of plane mirror are simultaneously photographed on negative.
把平面镜的映像和实物同时拍摄成底片。
2·Their functions can substitute for some uses of large diameter plane mirror, 0.2"light pipe, major diameter light pipe, arch type detector, T type detector and so on."
本文所介绍的平行度检测仪可以取代大口径平面镜，0.2秒平行光管、大口径平行光管、拱形检测架、T型检测架等大型检测仪器的某些使用功能。