题干
你一定有很多有趣的照片吧？请选取一张来描述一下和它有关的经历，和同学们分享一下吧。(至少五句话)
答案(点此获取答案解析）
范文：
This is a photo of me. I was in Qinhuangdao. I swam in the sea. It was sunny. The sky was blue. I watched many ships on the sea. I liked to swim. I had fun.
2SO3 (g)；△H=－a kJ·mol－1在相同条件下，要想得到2a kJ热量，加入各物质的物质的量可能是（ ）