文档预览： 选修3课件黑龙江省庆安一中 孙秀民（第二课时）二、键参数—键能、键长和键角键能：气态基态原子形成1mol化学键释放的最低能量。键能越大，化学键越稳定。破坏1mol化学... 点击下载

文档预览： ks5u精品课件Unit 3Fairness for allPictures from Beijing Olympic GamesPerformers hold pictures of multi-ethnic children during the opening ceremony of the ... 点击下载

文档预览： Unit 3 Teenagers should be allowed to choose their own clothes...3. _ (16岁的孩子) should not be allowed to drive.4. John just got ... 点击下载