【简答题】[ 互动探究 ] 将总体积为 10 mL 的 NO 与 O 2 混合,通入试管倒置在水槽中,反应停止后试管内剩余 2 mL 无色气体,求原气体中 NO 2 和 O 2 各多少毫升? [ 变式训练 1] 将 V mL NO 和 NO 2 的混合气体通过水吸收后,得到 a mL 无色气体 A 。将此无色气体 A 与等体积的 O 2 混合,通过水充分吸收后,得到 5 mL 无色气体 B ,试回答: (1...
【单选题】Donna can make a chair for about $100, she charges customers $150 to buy the chair, and customers perceive that the chair is worth $225. In this case, the consumer surplus is:
【简答题】同义句转换。 1. There is only a chair in the room. There is _____________ a chair in the room. 2. Mrs. Smith is busy. She is doing her housework now. Mrs. Smith is ______________ her housework now. 3. The t...
【简答题】Passage Three When the right person is holding the right job at the right moment, that person's influence is greatly expanded. That is the position in which Janet Yellen, who is expected to be confirm...