在150℃时，将一定质量的NH₄HCO₃放在密闭容器中分解完全．保持温度不变，求生成气体的平均相对分子质量．

十八大指出，要实施创新驱动发展战略。实施创新驱动发展战略的经济意义是（   ）

①发展新兴产业，抛弃传统产业       

②提高经济发展水平，增强自主发展能力

③提升产业层次，推动产业升级     

④加强国有经济的主体地位

    Next week is a holiday. I will do my homework on Monday. On Tuesday I will fly kites with my friends. On Wednesday I will play table tennis. On Thursday I will read storybooks(故事书). On Friday I will help my mother do the housework. On Saturday I will visit my grandma with my parents. On Sunday，oh，I don't know what to do.       

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