本一a和本二的区别

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.When traveling on icy and muddy roads, the top speed is 30 kilometers per hour.外府青年不经意间闯入花花世界的“天使之城”调动对汉王最忠诚的亲兵严密护卫王府。北宋初期，宋太宗赵匡胤面对内忧外患，招降北汉名将杨业 。杨业投奔大宋后为太宗立下汗马功劳，太宗赐其天波府，威望一时，却引起宋丞相潘仁美觊觎。太宗于是利用两臣子间的钩心斗角来稳固自己的王位，想不到因此使得杨家儿郎杨四郎与潘家女儿潘语嫣成了两家意气之争的牺牲品。Article 4 The labor and social security administrative department of the local people's government at or above the county level shall be responsible for supervising and inspecting the implementation of these Provisions by the employing units within their respective administrative areas.