This article believes, that the practice substantive characteristics is the humanity can use more factors to define own activity.
本文认为，实践的本质特征就是人类能用更多的因素限定自己的活动。
The author believed that insurance interest's substantive characteristics is the economic interest by the money computation, and the insurance interest can only be suitable in the property insurance.
笔者认为，保险利益的本质特征是能以金钱计算的经济利益，且保险利益原则只能适用于财产保险中。
Based on experimental facts, it is pointed out that only burning with purple black probably does substantive damage to the service life of parts considering the native characteristics of superalloys.
文中针对高温合金本身的特点，结合性态测试与疲劳试验结果指出：仅有紫色档才可能对零件的使用寿命构成实质性损伤。
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