Screw down mirror on door frame.

将后视镜拧紧到车门框架上。

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Mechanical structure is installed in a precision-guided screw device test platform, stepping motor control through the mirror group displacement to achieve CCD acquisition.

机械结构是一个安装在精密螺纹导引装置上的测试平台，通过步进电机控制反射镜组位移实现CCD采集。

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