A:②③
B:①②
C:①③
D:①④
向盛有氢氧化钠溶液的试管中加入一定量白色的硫酸铜固体粉末,恰好完全反应,过滤,得到溶质质量分数为14.2%的无色溶液10g.请计算:
—What do you have for breakfast?
—I often have __________ or __________.
________all the work finished ahead of time,I feel relaxed and very happy to be reading the papers.