[电] luminous sensitivity of phototube

guāng diàn guǎn guāng líng mǐn dù ㄍㄨㄤ ㄉㄧㄢˋ ㄍㄨㄢˇ ㄍㄨㄤ ㄌㄧㄥˊ ㄇㄧㄣˇ ㄉㄨˋ