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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.UDP斗战胜佛，战天斗地，佛门最擅战斗的佛，不知不觉中已然出现。Visitor visitor = new MyVisitor ();知名女同剧情剧集《拉字至上》续集定名：《拉字至上：Q世代》(L Word: Generation Q)，并宣布今年秋季档开播，仍在Showtime。 前作主演Jennifer Beals(饰演Bette)、Katherine Moennig(饰Shane)、Leisha Hailey(饰Alice)回归出演原角色，并和前作制作人Ilene Chaiken一起任执行制作，还会有一些全新角色。 新季是老版的续集，运作人为Marja-Lewis Ryan(2010年喜剧片《四角恋》编剧、《6 Balloons》导演兼编剧)，共8集。一个女孩和三个男人,错,四个男生的关系.花花公子,导演,穷明星,母亲的情人.看完此剧,三观崩了.也许以反面例子提醒世人,要发展正常的男女关系,才是对自己,对别人负责的表现.Ring fire lanes should be set up for public buildings such as halls with 2,000 seats and exhibition halls with an area of more than 3000m2. 6.0. 6 Fire lanes shall be set up in factories and warehouses. Circular fire lanes shall be set up for Class a, Class B and Class C factories with an area of more than 3000m2 or Class B and Class C warehouses with an area of 1500m2. In case of real difficulties, fire lanes shall be set up along the two long sides of the building. 6.0. 7 Fire lanes shall be set up in the open storage yard area of combustible materials, liquefied petroleum gas storage tank area, Class a, B and C liquid storage tank area and combustible gas storage tank area. The setting of fire lanes shall meet the following requirements: for storage yards and storage tank areas with reserves greater than those specified in Table 6.0. 7, annular fire lanes shall be set up. For combustible material storage yards with an area of more than 30000m2, an intermediate fire lane connected with the annular fire lane shall be set up, and the spacing between fire lanes shall not be more than 150.0 m m.. Liquefied petroleum gas storage tank area, Class a, B and C liquid storage tank area, combustible gas storage tank area, the annular fire lanes in the area should be provided with connected fire lanes. The junction of the middle fire lane and the annular fire lane shall meet the requirements of the turning radius of the fire truck. Table 6.0. 7 Storage of cotton, hemp, wool, chemical fiber (t) straw, wheat straw and reed (t) wood (m3) Class a, B and C liquid storage tanks (m3) combustible gas storage tanks (m3) 1000 5000 5000 1500 500 300 00 liquefaction