【简答题】Harry’s father bought a magazine which gave its readers information about all kinds of products and helped them make the best choice while buying. Harry borrowed his father’s magazine when he needed a...
【简答题】Harry’s father bought a magazine which gave its readers information about all kinds of products and helped them make the best choice while buying. Harry borrowed his father’s magazine when he needed a...
【单选题】某碱样为 NaOH 和 Na 2 CO 3 混合溶液,用 HCl 标准溶液滴定,先以酚酞作指示剂,耗去 HCl 溶液 V 1 mL , 继以甲基 橙 为指示剂 , 又耗去 HCl 溶液 V 2 mL , V 1 与 V 2 的关系是 A.V 1 = V 2 B.V 1 = 2V 2 C.2V 1 = V 2 D.V 1 > V 2 E.V 1 < V 2