【简答题】某小组同学将一定浓度Na 2 CO 3 溶液滴入CuSO 4 溶液中发现生成了蓝色沉淀.甲同学认为沉淀是CuCO 3 ;乙同学认为沉淀是CuCO 3 和Cu(OH) 2 的混合物,他们设计实验测定沉淀中CuCO 3 的质量分数. 已知:CuCO 3 和Cu(OH) 2 均为蓝色,难溶于水. (1)按照甲同学的观点,发生的反应属于4种基本反应类型中的______. (2)乙同学利用如图所示装置进行测...
【简答题】Compared to the human being, what is the advantage of Tibetan antelope(藏羚羊) in Tibetan plateau with insufficient oxygen?
【简答题】阅读理解。 In Texas, there was once a prairie dog town that housed about 400 million of the small,fat rodents (啮齿动物) in its network of tunnels and burrows (穴). But it was not crowded in this town. There wa...
【单选题】At the time of its fall,the Bastille housed ____.
A.
a large number of prisoners
B.
a lot of writers who had been against the government
C.
some dozens of people who believed in free speech and free thinking
【简答题】A.room B.home C.house D.Glenns'
【单选题】企业进行沉淀资金融资时,要注意其缺点,以下属于其缺点的是()。
A.
若折旧期结束时不能收回沉淀资金,将大大影响企业的固定资产更新技术改造
【判断题】The library is currently housed in the British Museum.