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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.多读些书，开拓眼界即可。3. Voluntary Service: At the moment, many young and middle-aged people in rural areas are working in the coastal areas of Guangdong. Most of the people who stay at home are old, weak, women and children. Naturally, they will encounter many difficulties in life and study. We will call on our volunteers to do what they can for these lonely, elderly and left-behind children and bring them some real help and convenience.一个饥饿的沙昂把农夫的陶灶变成了比萨饼厂。The banking industry has adopted a certain degree of cooperation mechanism when attacked. All information they disclose will be strictly protected and will only be shared with their internal counterparts. This collaborative approach, which combines restrictive mechanisms, enables the banking industry to perform better than most other industries in terms of safe collaboration.