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(Neutral Current Sense)1. You are in an undetermined position (bug point). For example, on the rolling gate of C2M5, or you cheat and fly into the air.汪直是这样，胡宗宪是这样，曾经的徐文长也是这样，人活于世，能遵循圣人之说，为帝王尽忠尽孝，这就是全部。Professional decoration companies will sign a formal contract with customers before the formal start of construction. If there are quality or engineering problems after the decoration, most of them can have more responsibility, but pay attention! When signing the contract, the customer must understand all the details in the text, and what he does not understand must be made clear. At the same time, the responsibility for the project quality and problems must be reflected in the contract.[Favorite this article] [Download]Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.