题干
—What do you think of the robots in the future?
—I think they won't __________ do all the work like humans.
A：can
B：like
C：able to
D：be able to
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