Optan奥普通牌照相机optvi.选择；决定opto-electronic tracker光电跟踪仪optimizing charge mixture优化配料optimizing control system最优控制系统,最佳控制系统optoelectronic transistor光电晶体管,光电子晶体管optimizing teaching means优化教学手段optimizing site selection优化选址optimizing control action优化控制动作optoacoustic spectroscopy光声光谱法opto-mechanical scanner光机扫描器optoelectronic properties光电特性