题型:选择题 2012伦敦奥运会火炬的燃料为丙烷(C3H8).下列关于丙烷性质的描述,属于化学性质的是A.无色气体B.难溶于水C.沸点为-42.1℃,易液化D.易燃烧,与空气与一定体积混合遇明火可能爆炸 查看答案
题型:选择题 Mr. Brown is _____ a teacher to us; we look on him as our friend. [ ]A. more than B. more or less C. less than D. more and more 查看答案