题型:选择题 You must practice ____ the violin everyday and you will play well.[ ]A. play B. playing C. to play 查看答案
题型:单项选择题 要配置10%(g/ml稀盐酸溶液1000ml,需要浓度约为37.0(g/g),相对密度约为1.18(g/ml)的浓盐酸约A.229m1B.261mlC.213m1D.286mlE.210ml 查看答案