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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.A. Men's 11 field events: 1km time trial, individual race (3 laps), 4000-meter individual race, 4000-meter team race, scoring race, Olympic race, Madison race and Kelindsay; Road Events: Individual Race, Individual Time Trial Mountain Bike: Cross-Country1948年春，保密局南京站二处侦防科科长李梅在一次行动中脑部受重创造成部分失忆，忘记了自己共产党员的身份。中共情报员佯装叛变设计让李梅的记忆复苏。和党组织恢复联系后的李梅配合组织完成任务，同时找准时机吸纳中央陆军大学战术教官高峰。保密局南京站站长胡一夫一直暗中监控李梅，李梅几次险象环生。期间她与高峰出生入死，擦出了爱情火花，结为连理。最终李梅协助高峰率部宣布起义，解放军百万雄师渡江，南京解放 。这是糟糕的一天，竜野（内村光良饰）的公司倒闭，女友也提出了分手。可第2天他竟然又回到了前1天，如是往复，开始了重复的人生。这样的策略确实不错，稳扎稳打，步步为营。Introduction: Another expression of attacking others, venting anger.