题目

下列实验目的可以达到的是（ ）  A．电解熔融氯化镁制取金属镁       B．氯化铵溶液与石灰水共热制取氨气 C．浓硫酸与硫化钠共热制取硫化氢   D．用饱和碳酸钠溶液除去二氧化碳中的氯化氢 答案：A 解析: 略排序。A. How much are they?B. May I have five oranges, please?C. Here you are.D. Good morning. Can I help you?E. Nine yuan, please.F. Thank you.G. Sure.________