题目

已知A、B两种气体在一定条件下可发生反应：2A+B＝C+3D+4E。现将相对分子质量为M的A气体m g与适量的B充入一个密闭容器内，恰好完全反应且有少量液滴生成，在相同的温度下测得反应前后压强分别为6.06×106和1.01×107Pa，且测得反应共放热QkJ。则该反应的热化学方程式是（   ）A．2A（g） +B（g）＝C（g） + 3D（g） + 4E（g）；ΔH＝－kJ/molB．2A（g） +B（g）＝C（l） + 3D（g） + 4E（g）；ΔH＝－kJ/molC．2A（g） +B（g）＝C（g） + 3D（g） + 4E（s）；ΔH＝－kJ/molD．2A（gIs picking cucumbers(黄瓜) as easy as picking f 1    ? Do sweet potatoes grow in trees or u 2    ? Students from Wuhan Foreign L 3    School get the answers. B 4    they go to the farm after class, it t 5    them the whole afternoon to pick cucumbers and dig(挖) sweet potatoes. The h 6    work lets them understand the life is difficult on a farm. They say they will never waste (浪费) f 7    any more. What's your opinion(观点) ？If you want to know what they think, just have a try in your f 8    time. The farm is very near,and all the v 9    are fresh. W 10    to the Nonggen Farm!1. f      2. u      3. L      4. B      5. t       6. h      7. f      8. f      9. v      10. W