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Polylactic acid (PLA) is a new bio-based and renewable biodegradable material, which is made of starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, then glucose and certain strains are fermented to produce high purity lactic acid, and polylactic acid with certain molecular weight is synthesized by chemical synthesis method. It has good biodegradability, can be completely degraded by microorganisms in nature under specific conditions after use, and finally generates carbon dioxide and water without polluting the environment, which is very beneficial to environmental protection and is recognized as an environment-friendly material. This thing is actually a long piece, and then "curled up" in it and wrapped in a cylinder shape. What's the use? You will see it in a short time.夏林说道：就按照原来的风格，大众更能接受，何必多玩花样。一种悲伤的气氛笼罩上来。男主为获大明宝图穿越回大明，变身赌神，经历了一系列事件之后，却发现了一个惊天阴谋，正直勇敢的他就要开启一场未知的救国赌途的故事。　　刀子嘴豆腐心的金梦瑶还好有个宽厚仁义的老公，牛建国不但不埋怨她怀不上孩子，还对她百依百顺。功夫不负有心人，一天小两口用试纸测出怀孕了，把全家人都高兴坏了，对心高气傲的儿媳金梦瑶也开始格外照顾。偏偏天不遂人愿，金梦瑶根本没怀上，是试纸出了问题。这一出闹剧过后，又经历了分房风《乡村爱情协奏曲》是经典长寿喜剧《乡村爱情》系列的第十部，2月5日起《乡爱10》将在腾讯视频全网独播，每周一至三20点更新两集，会员提前看下周！在这一部里，象牙山村的刘能、广坤、王老七商量着解决村里大龄单身青年的婚姻问题。于是几个人在村委会决定成立大龄青年婚姻理事会，帮助屯里的年轻人们脱单...以三个性格迥异的儿子为中心，透过经历结婚和离婚，悟出婚姻的真谛！