Conclusion: the physical nursing of active or passive measure and preventive anticoagulant treatment by low molecular weight heparin can obviously reduce the occurrence rate of deep vein thrombosis.
结论：主动或被动的物理护理措施以及低分子肝素预防性抗凝可明显降低深静脉血栓形成的发生率。
Active control is to analyses in advance the possibility of objective deviation, and to draw up and adopt every preventive measure, so that planned objective can be realized successfully.
主动控制就是预先分析目标偏离的可能性，并拟订和采取各项预防性措施，使计划目标得以顺利实现。
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