题干
As a wise department manager, he possesses a unique way to ______ huge tasks into small and doable units.
A：break through
B：break away
C：break off
D：break dow
答案(点此获取答案解析）
D
物与足量水反应，在标准状况下得到672mL混合气体，将混合气体电火花点燃，恰好完全反应，则原混合物中钠、氧化钠、过氧化钠的物质的量之比为