[经] additional costs assigned to byproduct

fù chǎn pǐn zài jiā gōng chéng běn ㄈㄨˋ ㄔㄢˇ ㄆㄧㄣˇ ㄗㄞˋ ㄐㄧㄚ ㄍㄨㄥ ㄔㄥˊ ㄅㄣˇ