[经] average costing of inventory

cún huò de píng jūn chéng běn jì suàn fǎ ㄘㄨㄣˊ ㄏㄨㄛˋ ㄉㄜ˙ ㄆㄧㄥˊ ㄐㄩㄣ ㄔㄥˊ ㄅㄣˇ ㄐㄧˋ ㄙㄨㄢˋ ㄈㄚˇ