下载APP
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】下列关于碳酸钠和碳酸氢钠的比较中，正确的是（ ）
A.
热稳定性：Na 2 CO 3 < NaHCO 3
B.
碱性：Na 2 CO 3 < NaHCO 3
C.
水中的溶解度：Na 2 CO 3 > NaHCO 3
D.
与足量的盐酸反应产生的气体的体积：Na 2 CO 3 < NaHCO 3
【单选题】How to Use the Sense of Smell Our sense of smell, which we normally take for granted, is nowadays being increasingly used for purposes which might surprise us if we aware of them. One area in which sm...
A.
3) preferred ______.A. the smell of shoes to that of flowersB. the smell of flowers to that of shoesC. the shoes in the room with purified airD. the shoes in the room with appealing smells
【单选题】下列实验中能利用相同装置作部分实验装置的是（ ）①除去碳酸氢钠固体中的碳酸钠②铜与浓硝酸反应制取二氧化氮气体③加热铵盐和碱的混合物制取氨气④鉴别碳酸钠和碳酸氢钠．
A.
①②
B.
①③
C.
②③
D.
③④