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面向对象的三大特征继承、多态和（）

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面向对象的三大特征封装、多态和（）。

使用static声明的方法可以调用非static声明的属性或方法

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翻译题The use of low molecular weight heparins (LMWHs) has several advantages compared to heparin， which includesimproved bioavailability at low doses when administered subcutaneously, a longer plasma half-life, and a more predictable anticoagulant response allow for simpler dosing without laboratory monitoring

翻译题Heparin is a naturally occurring polysaccharide with an approximate molecular weight ranging from 5000-40000 Daltons and the mean molecular weight in the range of 12000-14000 dalton.. LMWH, on the other hand, consists of only short chains of polysaccharides with an average molecular weight of 4.5 KDa.