To adjust adequately for comorbidity and severity of illness in quality improvement efforts and prospective clinical trials , predictors of death after acute renal failure ( arf ) must be accurately identified 共病是指相对于原始诊断或相对于研究主题所指病情而言，共同存在或附加的疾病。共病可以影响受累个体的功能以及生存率，可用来预测住院时间、医疗费用和转归或生存率。
The market and firms are the two extremes of a continuum . they are not absolutely separated , but link and interact with each other , which results network structures and many kind of institutional arrangements in both intra - firm and inter - firm sense 无论是在市场之中，还是企业内部，市场原则和企业组织原则都是共同存在的；企业与市场处于一个连续统的两端，它们之间不是相互对立的，而是相互连接、相互渗透的。
The quadratic nonlinear term and the cubic nonlinear term that coexist in equation ( 1 ) , thus causes difficulty in studying this sort of system through the analytical method and correspondingly makes the solution of analytical expression of homoclinic orbit or heteroclinic orbit in hamilton system extremely difficult 二次非线性项和三次非线性项共同存在于方程( 1 )中，使得用解析方法研究这类系统的难度增大，对应hamilton系统中的同宿轨道或异宿轨道的解析表达式的求解相当困难。
Although the construction methods of duality sequence have their excellences , they have limit . for example , there are few number of address code , and the improved degree of correlation is near to zero . therefore , the duality sequence can not satisfy the demand of users and adapt the increase of user 虽然二元序列的各种构造方法有其各自的优点，但却共同存在着许多限制，如地址码数量过少，相关性能改善程度已趋近于零等，从而无法适应移动用户数量的不断增加且无法满足用户对通信质量不断提高的要求。
And also , the wear resistance at ambient temperature and of za27 alloyed with mn when lightly loaded is desirable but becomes worse at high temperature . the wear mechanism of the one mixed with both adhesive and abrasive wear under sliding friction conditions ( at high temperature ) Si的加入量为1 - 3时， za27合金的磨损量最少，高温摩擦性能最好；加入mn后， za27合金在低温轻载下耐磨性能较好，高温耐磨性能不理想；在滑动摩擦条件下(高温)的磨损以粘着磨损和磨料磨损两种方式共同存在。
In special perspective of an administrator of shanghai municipal education commission and on basis of author knowing well in the development of every private college in college in shanghai , this article tries to go beyond the general research . it aims to explore some potential issues that have not been covered or not been deeply explored , and then offer some practical strategies to resolve the problems from the contingent development point of view 本文注意避免对民办教育的一般研究，试图以市教委民办高等教育管理人员的特有视角以及多年来对本市每一所民办高校的全面了解，去把握民办高教发展的脉络，揭示共同存在的问题，尤其是一般研究未涉及或涉及不深的潜在问题，在此基础上，从可持续发展的要求出发，提出解决问题的思路，这些思路力求可行，这就是本文的立意所在。
