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九五年中考物理试题中一道问答题是:“人们常说铁比木头重,这种说法确切吗?为什么?”此题包含两个隐含条件:一是铁的密度大于木头的密度;二是铁和木头的体积是不定的。前一个条件只涉及密度的概念和量值,且是生活中常遇到的事例,所以是属于具体运算模式的范畴(适用于具体物体,直接可以观察到的性质和简单关系)。第二个条件需要进行组合思维;分离和控制变量。所以是属于形式
One quiz question in the 1995 physics test was: “People often say that iron is heavier than wood. Is that true? Why?” This question contains two implied conditions: First, the density of iron is greater than the density of wood. Second, the volume of iron and wood is uncertain. The former condition involves only the concept and magnitude of density, and it is a case that is often encountered in life. Therefore, it is a category that belongs to a specific operation mode (applicable to a specific object, directly observable in nature and simple relationship). The second condition requires a combination of thinking; separation and control of variables. So it belongs to the form