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Endothermic theory: When the flame retardant is heated, endothermic reactions occur, such as decomposition, melting, sublimation, phase change, etc., which make the fiber dissipate heat rapidly and fail to reach the combustion temperature.朝鲜战争后期的1953年7月,当战争各方在进行和平停战谈判时,美军为了在谈判桌上增加筹码,命令克莱门斯中尉率领美军一个连进攻没有军事价值的255高地.他们知道板门店停战谈判可能随时会达成和平协议,所以一些士兵不太愿意做无谓牺牲.然而,克莱门斯中尉认为这是他们的爱国职责,在他的指挥下,美军在猪排山阵地上与中朝军队进行争夺战,甚至进行残酷的肉搏战.等到增援部队到达时,135人的连队打的就剩下25个人.This picture is enough to hit you in the face.In the era of homogenization of products, brand personality is increasingly showing its important position in communication and marketing. Spokesmen should conform to brand personality, and their image and characteristics must match the enterprise products or target consumer groups they represent.He used to work in an investment and finance company and started to leave office for two years. The company did not release him until a year ago. He thought that this was his last involvement with his old employer. On Tuesday, I suddenly received a notice from the police station to investigate.There are no established rules for the three-person four-legged competition. The rules vary according to the competition venue, participants, number of participants, purpose of the competition, etc.Freemind: Windows, Mac, Linux