对下列实验装置叙述错误的是（ ）
A．图1：该装置不能制取并收集到干燥纯净的NH3
B．图2：若X为锌棒，开关K置于A或B处均可减缓铁的腐蚀
C．图3：白色固体先变黄色，最后变成黑色，可以得出AgI溶解度小于Ag2S
D．图4：可以验证碳酸酸性强于硅酸
答案：C
题目分析：A、氨气采用向下排空气法收集；B、接在A处为外加电流的保护法，锌腐蚀保护铁，接在B处为牺牲阳极的阴极保护法；C、沉淀的转化虽然是朝着溶解度小的方向转化，但需要在离子浓度相同的前提条件下；D、强酸制弱酸，可以证明。
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| Many children have birthday cakes on their birthdays. In some _1__, like England and Scotland, there is another custom, too. People beat or hit the__2__on his/her birthday. This may hurt__3__, but they say it is very lucky for the child. The child must __4__cry. The custom says, if you __5__, you will cry all year. They say the birthday spanks (一巴掌) is to make the bad spirits(邪气) __6__. The harder you spank the better. In Belgium, another country in Europe, the custom is a little __7__. There a parent goes into the child's room __8__in the morning with a needle. As soon as the child __9__ up, the parent pricks(刺) the child with the needle. This is for good __10__. | ||||
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