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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.Follow up the treatment of patients to ensure timely implementation of examination and treatment.所以我们要尽量保全他们，没有合适的借口，龙且也不好直接出兵。5. Appearance Mode若你觉得难以面对张离，便来我二房，跟花生一起住。黎章和黎水都怔住了，愣了好一会，也没有说话。"Well, One more, This soldier, I was impressed, If I remember correctly, it should be Wang Yuanhe. Like Jiang Yong, All spilled by this poisonous liquid, However, he was unlucky enough to splash on his face. But he was quick, He grabbed a medical bandage prepared for dealing with war wounds and wiped it. Most of the liquid was wiped off in the first place, and there was not much left, so although it was blistered, it was not serious. Later, I also specially checked that the bandage he used to wipe the venom was originally white, but after contacting with the venom, it turned black, and when touched, it rotted, just like a rag bitten by worms.