The age replacement decision for the system with intermittently used equipment is studied in this paper.
研究了设备间歇使用系统的年龄替换决策。
The expected cost per unit -time for infinite time span is analyzed strictly under the mathematical model constructed, and the optimum age replacement decision is also discussed.
在建立数学模型的基础上，分析了系统长期单位时间内的期望费用，并讨论了最优年龄替换决策。
Scientists believe the secret to the clams' longevity is a slowed cell-replacement process. But why they age so slowly is unknown.
科学家们认为蛤蜊长寿的秘诀在于其细胞代谢过程的缓慢，但是仍然不知道它为何如此缓慢。
Objective To study safety of hip joint replacement on the femoral neck fractures in the advanced age to enhance life quality.
目的研究人工关节置换术治疗高龄股骨颈骨折围手术期安全性，以提高高龄及超高龄者的生活质量。
For slow replacement the age distribution function assumed is unimportant.
对缓慢置换，假设的时龄分布函数变得不重要。
Objective: To study the strategy of warfarin anticoagulation and the relationship between age, gender, body weight and the amount, efficacy of warfarin, after mechanical heart valve replacement.
目的：研究心脏机械瓣膜置换术后华法林抗凝的调整策略及年龄、性别、体重与华法林抗凝剂量、疗效的关系。
Methods From 1996.1 to 2005.12, valve replacement were performed in 561 patients with mitral valve restenosis (age from 27 to 70), under general anesthesia and hypothermic CPB.
方法1996年1月至2005年12月，561例二尖瓣再狭窄患者接受瓣膜置换，年龄27～70岁。手术均在全身麻醉、低温、体外循环下进行。
Methods Bipolar artificial femoral head replacement was adopted in 16 cases of unstable intertrochanteric fracture for the patents with mean operation age of 86.
目的探讨双极人工股骨头置换手术治疗高龄不稳定型股骨粗隆间骨折患者的临床疗效。
To research on replacement period of auto - transmission fluid should be great significance to ensure the auto -transmission on normal work and prolong it 's usage age.
自动变速器油更换周期问题的研究探讨，对保证汽车自动变速器的正常工作和延长其使用寿命具有重要的意义。
Conclusions the correct rehabilitation instruction of nurse is importance to the healing of the replacement operation of artificial femoral head of the old age diabetic.
结论护士正确的康复指导对老年糖尿病人人工股骨头置换术的愈结合非常重要。
Conclusions the correct rehabilitation instruction of nurse is importance to the healing of the replacement operation of artificial femoral head of the old age diabetic.
结论护士正确的康复指导对老年糖尿病人人工股骨头置换术的愈结合非常重要。
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