氢气作为21世纪极具开发前景的新能源之一,理由是() ①燃烧热值高 ②原料资源丰 发布时间:2017-04-28 20:53 │ 来源:www.tikuol.com 题型:选择题 问题: 氢气作为21世纪极具开发前景的新能源之一,理由是( )①燃烧热值高 ②原料资源丰富 ③储存和运输时安全性高 ④燃烧产物无污染A.①②③B.①②④C.②③④D.①③④
题型:选择题 —What do you do? —_________. [ ]A. I'm thirteen B. I'm a girl C. I'm a student D. I'm at work 查看答案
题型:选择题 He is an teacher, for every he did is very successful.A.experienced; experienceB.experienced; experimentsC.experimental; experimentD.experienced; experiment 查看答案