[经] material requirement planning

yuán cái liào xū yòng liàng jì huà ㄩㄢˊ ㄘㄞˊ ㄌㄧㄠˋ ㄒㄩ ㄩㄥˋ ㄌㄧㄤˋ ㄐㄧˋ ㄏㄨㄚˋ