[经] payment terms of commercial agreement

shāng yè qì yuē de fù kuǎn tiáo jiàn ㄕㄤ ㄧㄝˋ ㄑㄧˋ ㄩㄝ ㄉㄜ˙ ㄈㄨˋ ㄎㄨㄢˇ ㄊㄧㄠˊ ㄐㄧㄢˋ