[经] lump sum on firm bill quantities

gù dìng gōng chéng liàng zǒng jià ㄍㄨˋ ㄉㄧㄥˋ ㄍㄨㄥ ㄔㄥˊ ㄌㄧㄤˋ ㄗㄨㄥˇ ㄐㄧㄚˋ