替代词常用来替代上文出现过的某一词或句子,以避免重复,这在英语中用法极广。纵观近10年的高考试题,替代词是备受青睐的命题热点之一。出现频率较高的有it,one,ones,that,th
慢性阻塞性肺疾病（COPD）急性发作患者往往需要住院治疗，而住院期间的临床护理对于改善患者病情和提高患者生活质量具有重要意义。我们回顾性分析32例COPD急性发作患者的临床资料
In this paper, we have rigorously analyzed a model to find the effective control strategies on the transmission dynamics of a vector-borne disease. It is proved
目的：探讨超声心动图测定在胎儿先天性心脏病产前超声诊断中的临床效果。方法采用 LOGIQ 7超声诊断仪检查528例先心病高危胎儿，在心脏超声四腔观基础上测定胎儿心脏轴，并从多切
Death toll by smoke in fire is estimated at 70% which emphasizes the importance of smoke control system to deal with the fire smoke. In advanced countries, the
目前，冠心病已经成为人们死亡的主要原因之一，冠状动脉旁路移植术作为治疗冠心病的重要方法，具有重建血运完全，缓解心绞痛效果确切并能延长患者生命的优点，尤其对于左主干病变和三
Thomas-Fermi theory is an approximate method, which is widely used to describe the properties of matter at various hierarchical levels (atomic nucleus, atom, mo
In order to establish the design methodology of a small axial fan, the axial fan with impeller diameter of 36 mm was designed, manufactured and tested. Especial
目的探讨股深动脉重建治疗下肢动脉硬化闭塞症（LEAOD）患者下肢缺血的临床疗效。方法选取FontaineⅢ、Ⅳ期LEAOD患者45例,对患者应用股深动脉重建手术进行治疗,对治疗效果进行观
The present study concentrates on the analysis of MHD free convection flow past an inclined stretching sheet. The viscous dissipation and radiation effects are