photoxic光损伤photon.照片v.拍照photoemissive element光电发射元件,光电池,光电放射元件photometric precision吸光度重复性photo multiplier tube光电倍增管Photoelectric monitor光电检测photoisolator trigger光隔离触发器photovoltaic junction光电压结,光生伏打结photollergic reaction光变应性反应photoelectrochemistry光电化学photoresistance relay光敏电阻继电器photochemical process光化学过程