We got into terrible scrapes.我们走投无路。How did you get a few scrapes on your knee?你膝盖上的几处擦伤是怎么弄的?She gets into these silly scrapes because she doesn't think before she acts.她在行动之前总不思考,所以才会陷入这种荒唐的窘境....
氢是锌和硫酸反应的生成物.Hydrogen is a product of the reaction between zinc and sulphuric acid.较高的工作电压引起碳生成物的分离.The higher operating voltage causes a breakdown of carbon products.根据不同的反应条件,深入研究并建立及推广了生成物浓度数学模型.By experiment examinat...