题目

As online learning becomes more common and more and more resources are converted to digital form, some people have suggested that public libraries should be shut down and, in their place, everyone should be given an iPad with an e-reader subscription.Supporters of this idea state that it will save local cities and towns money because libraries are expensive to maintain. They also believe it will encourage more people to read because they won't have to travel to a library to get a book; they can simply click on what they want to read and read it from wherever they are.However, it would be a ser 下列有关物质变化的说法正确的是(  ) A.熔融态的Al2O3导电、12C转化为14C都属于化学变化 B.根据反应中的能量变化,将化学反应分为“化合、分解、复分解、置换”四类 C.用热的纯碱溶液洗涤沾有油污的器具时涉及化学变化和物理变化 D.将盛有NO2气体的密封烧瓶,放入热水中气体颜色加深的变化是物理变化
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