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【单选题】
It’s said that the Kitchen God gives an annual report to the Jade Emperor of heaven on December 23rd (lunar calendar), which is about what each family did for the whole year. Traditionally, Chinese people offer sacrifices to the Kitchen God with various sugar cakes, nuts, and some people will eat Tofu soup. Meanwhile, people will stick a pair of couplets at each side of the portrait of the Kitchen God, hoping that the Kitchen God will report the good side and ignore their evil deeds, so that they could have a better life in the new year. what do you think is the main reason for this tradition to disappear?A.
People are becoming lazy.
B.
With more and more people building modern houses and moving to the cities, there are few people have kitchen stoves now.
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【简答题】将等体积的浓度均为 0.002 mol·L -1 的 KCl 和 KI 混合,逐滴加入 AgNO3 溶液(设体积不变),问 Cl- 和 I- 沉淀顺序如何?能否用分步沉淀方法将两者分离? [ K y sp( AgCl ) =1. 77 ×10-10 , K y sp( AgI ) =8.5 2 ×10-17 ]
【简答题】蛋由 、 和 三部分构成。
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