A meta-analysis based on 48 qualified papers with 99 effect sizes was conducted to explore the correlation of children’s peer relationship and aggressive behavior. The results showed an obvious negative correlation between aggressive behavior and peer acceptance as well as number of friendships, an obvious positive correlation between aggressive behavior and peer rejection as well as social impact. The participant’s age and the measure of peer relationship and aggressive behavior could affect the correlation between aggressive behavior and some types of peer relationship.

#红外线知识分享##塑料知识分享##橡塑知识分享#
人工制成的有机高分子物质,或称高分子材料,是为数众多的低分子有机化合物以共价键构成的分子量较大的化合物,分子量都在一万以上,有些高达一百万。
Artificially made organic macromolecule substances, or macromolecular materials, are a large number of low-molecular organic compounds with large molecular weights composed of covalent bonds. The molecular weights are all over 10,000, and some are as high as one million.

这些物质,按用途可分成三大类,即合成树脂、合成橡胶、合成纤维。
These substances can be divided into three categories according to their purpose, namely synthetic resin, synthetic rubber, and synthetic fiber.

按制品种类：模压件、注塑件、吹塑件、吸塑件、薄膜、皮革、纸张、纤维、胶丝、涂料、粘合剂等。
According to product types: molded parts, injection molded parts, blow molded parts, blister parts, films, leather, paper, fibers, glue filaments, coatings, adhesives, etc.
（以上内容摘取自第三方文章）

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