单词self-preparation
网络: 准备迎接随时的挑战
the construction ratio: I construction engineering requirements, self-preparation # 425 ordinary portland cement.
施工配比：俺施工工程要求，自行配制#425普通硅酸盐水泥。
The ethylene glycol antimony solution of self-preparation in PET plant
聚酯装置自行制备乙二醇锑溶液