[经] difference between cost and book value

chéng běn yǔ zhàng miàn jià zhí chā yì ㄔㄥˊ ㄅㄣˇ ㄩˇ ㄓㄤˋ ㄇㄧㄢˋ ㄐㄧㄚˋ ㄓˊ ㄔㄚ ㄧˋ