optical sag视光垂度opticaladj.视觉的；光学的optical line terminal光线路终端optical system design光学系统设计Optical-feed system光学馈电系统optical microanalyser光学微分析器optical circuit board光学电路板optical oxygen sensor光化学氧传感器optical Ramsey fringe光学Ramsey线形Optical manufacturing光学加工optical packet switch光分组交换optical emission line光学发射线