Optan奥普通牌照相机optvi.选择；决定optogalvanic spectroscopy光电流光谱法optimizing machining data切削用量优化Optimizing spares support备件优化optimizing mix proportion优化配合比opto-magnetic resonance光磁共振optimizing pouring system优化浇注系统opto-hybrid transmitter光混合发射机optidress projector scope光学修正投影显示器optimizing control theory最优控制理论optoelectronic transducer光电换能器