【单选题】A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.
【简答题】完形填空。 You'll see a new doctor at a hospital near London if you go there. He's very clever, 1 he never speaks. He can work 24 hours a day and never gets 2 . He's one metre tall and has a face 3 a TV sc...