photoemf光电动势photon.照片v.拍照photochemical initiator光化学引发剂photoelectric magnitude光电星等photochemistry oxidized超声波photoconductive current光导电流photoelastic photograph光测弹性照相photo-Fenton reaction光-Fenton反应photovoltaic transducer光伏式传感器photo-copying service照相复制服务Photoeatalytic activity光催化photo-video satellite摄影和电视卫星