下面的问题中,与盐类水解有关的是①为保存FeCl3溶液,要在溶液中加入少量盐酸;②实验室盛放Na2CO3、Na2SiO3等溶液的试剂瓶应用橡胶塞;③在NH4Cl或AlCl3溶液中加入镁条会产生气泡;④长期使用硫酸铵,土壤酸性增强。
All the dishes in this menu, ______ otherwise stated, will serve two to three people.
The children loved their day trip, and they enjoyed the horse ride ______.
Progress______ so far very good and we are sure that the work will be finished on time.
Charles was alone at home, with_______ looking after him.
It is often ______ that human beings are naturally equipped to speak.