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在初中化学教材里,就对化学变化作了定义:所谓化学变化,就是有新的物质生成的变化。其实,这种说法很笼统。什么样的物质是
In the junior high school chemistry textbook, the definition of chemical change is defined: the so-called chemical change is the change of new material production. In fact, this statement is very general. What kind of substance is