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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.鬼马AI少女遇上傲娇男明星，一场娱乐圈阴谋下的爱恋成长，一对人工与智能对决下的欢喜冤家。。。。叔叔壮烈的异世界生活和侄子敬文的新感觉异世界喜剧拉开了帷幕！怎么会突然去了越国，那些出手相助的神秘力量是越国人？尹旭为什么要就他们的妻儿，难道只是为了当年的那一点情分？显然不是，今时今日，诸侯王之间的一丁点事情都充满了利益纠葛。且说眼前，他接到香荽的信，随口问道：张姑娘在忙什么呢？毛凡脱口而出道：张姑娘跟赵家少爷和小姐玩雪呢，在雪地里用弹弓打麻雀。不就是雪茄么。