[电] linearity-graded impurity distribution

xiàn xìng xié biàn zá zhì fēn bù ㄒㄧㄢˋ ㄒㄧㄥˋ ㄒㄧㄝˊ ㄅㄧㄢˋ ㄗㄚˊ ㄓˋ ㄈㄣ ㄅㄨˋ