日韩高清av无弹窗

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.The fabric first becomes yellowish through leaf-dyeing.ABC正式宣布续订《实习医生格蕾》第十二季。　　一日,北宋仁宗年间，某年京师瘟疫盛行，军民伤损甚多。天子钦点洪太尉前往江西信州龙虎山，宣请张天师驱邪除祟。洪太尉寻天师不见，却因固执走了上清宫中镇压的一百单八个魔头。红椒咬了胡钊下巴的事，早为人知。