method of ratio production比率产出法比率产出法 perinatal morbidity and mortality围产期发病率和死亡率 ..
双语例句
1
The shortcoming of current slag cavity brick is presented . Its size is determined. The action ofproductionmethod and gap ratio on its strength is studied in this paper.
Through choosing referential time, production and decline ratio, this method is more flexible, simple and practical than the Arps method in terms of analyzing the production decline.
Now the method is successfully used in the production. Thereby difficult problem that we test relaxation ratioof prestressed concrete steel wire for 1000 hours has been solved.