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Thromboembolic diseases are currently one of the causes that endanger human health and lead to the highest mortality rate, such as myocardial infarction, cerebral thrombosis, deep vein thrombosis, cerebral embolism, pulmonary embolism, etc. In addition, thrombosis is an important pathological process involved in the pathogenesis of many diseases. 1. Anticoagulant therapy (1) Heparin: Heparin is a commonly used anticoagulant and is a highly sulfated glucosaminoglycan. Heparin is widely found in mammalian tissues, and mast cells are the main producing sites. The main sources of medicinal heparin are bovine lung and pig intestinal mucosa. Heparin used clinically is called unfraction heparin (UFH) because it is a mixture of components with different relative molecular weights. The relative molecular weight is between 33,000 and 30,000, which is also called standard heparin (SH). The drug name is heparin sodium. (2) Low molecular weight heparin: crude heparin is cracked into some fraction with relative molecular mass of 1000 ~ 12000 by chemical or enzymatic hydrolysis methods, and then purified. There are at least 10 kinds of low molecular weight heparin prepared by different manufacturers and different methods.　　孙家栋（佟大为 饰）：以无数次的试验失败为切入点，展现其代表的中国科学家永不言弃的探索精神。21712. Next, we enter the user agreement interface of MindManager Mind Mapping Software. We can read the usage agreement of the interface, then click the "I agree with the terms of the user agreement" option in the lower left corner of the interface, and then click next.《作钓方法论》是快乐垂钓频道全新打造的一档垂钓求真类栏目。栏目以广大钓友垂钓过程中所存在的一些约定俗成的技法和理论为基础，进行科学而又周密的户外实验，以验证该技法或道理存在的科学性和合理性。Aircraft to land: Approach the appropriate runway or open and flat area. Press Page Down to lower the propulsion and slow down the plane. Press the G key to deploy the landing gear. Press the F key to increase the flap adjustment. This will slow down the plane. After landing, please use two-wheel brakes to slow down the plane. Press, (Comma) key to apply revolver brake; Press