题目

If you plan on visiting to Fiji, you are probably looking for some fun things to do. Below are four unusual places. The Poseidon Resort    The Poseidon resort is an underwater resort that gives visitors a beautiful view of sea life. This resort covers 255 acres. It’s covered and surrounded by a lagoon (咸水湖) that covers 5,000 acres and is about 90 feet under water, giving you a beautiful view of sea life right before your eyes. This resort even has a hotel for those who would prefer to have the unusual experience of sleeping and waking up to the beautiful scenery all around th实验室内有一瓶化肥的标签已脱落，只知道它是NH4Cl、（NH4）2SO4和KNO3中的一种．现进行如下实验：（1）取少量样品在研钵中与 混合研磨，有刺激性气味的气体放出．（2）另取少量化肥样品与试管中，加入少量水溶解，再滴入图中的 溶液，产生白色沉淀．根据以上实验，可知该化肥为 ．