[经] machine hour plus supplementary rate method
jī qì xiǎo shí jiā bǔ chōng lù fǎ ㄐㄧ ㄑㄧˋ ㄒㄧㄠˇ ㄕˊ ㄐㄧㄚ ㄅㄨˇ ㄔㄨㄥ ㄌㄨˋ ㄈㄚˇ