题目

Holidays Holiday News Vacancies (空位) now and in the school holidays at a country hotel in Devon. This comfortable, friendly home-from-home lies near the beautiful quiet countryside, but just a drive away from the sea. The food is simple but good. Children and pets are welcome. Reduced prices for low season. The Snowdonia Center The Snowdonia Center for young mountain climbers has a mountain climbing lesson. The beginners’ costs are ￡57 for a week, including food and rooms. Equipment is included except walking shoes, which can be hired at a low cost. You must be in good health and prep下列叙述正确的是A．KSp[MgF2]>KSp[Mg(OH)2]，不能实现Mg(OH)2转化为MgF2。B．常温下，同浓度的Na2S与NaHS溶液相比，Na2S溶液的pH大C．等物质的量浓度的NH4Cl溶液和NH4HSO4溶液，后者的c(NH4＋)大D．FeCl3与KSCN反应达到平衡时，加入KCl溶液，则溶液颜色变深