题型:选择题 ----- Is there anyone who is going to the Great Wall? ----______ .A.None B.No one C.No D.Not any 查看答案
题型:选择题 5 g某金属M的样品(杂质不参与反应)与25g 20%的盐酸恰好完全反应,所生成的盐中,氯元素质量分数为50%,则样品中M的质量分数为( )A.50%B.95.5%C.97.3%D.99.1% 查看答案