It is a special application to establish a long optical reference for measuring relative Angle between measurement instruments in optical engineering.
建立测量仪器之间相对角度测量用的长的光学参考基准，是光学工程中的一种特殊应用。
It is a special application to establish a long optical reference for measuring relative Angle between measurement instruments in optical engineering.
建立测量仪器之间相对角度测量用的长的光学参考基准，是光学工程中的一种特殊应用。
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