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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.这本笔记如果拿去古代，的确珍贵万分，但是放在现代社会，纪念意义远远大于实际用途。放心，我黄泉路上等着你。On the contrary, if such system data structure objects are easy to change and new data objects are often added, it is not suitable to use visitor mode.B women's 7 field events: 500m time trial, individual race (3 laps), 3000 m individual pursuit and scoring; Road events: 70km individual race, individual time trial mountain bike: cross-countryAlthough it is more worry-free and labor-saving to choose a decoration company for decoration, there will also be drawbacks. Many people will no longer ask about the decoration after handing it over to the decoration company, and it is wrong to wait for acceptance. Because some informal decoration companies will have a series of phenomena such as deliberate charging, project quality problems, slow project progress and excessive project costs. Therefore, even if the decoration company is chosen for decoration, it is necessary to go to the construction site at any time to keep an eye on the work.To add one more word, it's not why you open the post, it's just convenient for you, me and him. Since you open the post, it's a two-way communication.