置换

The elasticity of substitution is a useful concept in several areas of economics.

置换弹性在若干经济学领域内是一个有用的概念。

The results show that, by the increment of the cathodic current density,the alloy electrodeposit was formed in displacemental solid solution, and that, with W content raised,lattice parameter expanded,and lattice distortion increased, whereas grain size decreased. All the morphologies of the deposits were presented in neat granular structure in the growth of electrocrystallization.

结果表明，随着电流密度的提高，合金沉积层中的W含量增大；形成置换固溶体的合金沉积层晶格参数涨大、晶格畸变度增大、而显微晶粒尺寸减小；合金沉积层的电结晶生长形态均呈现整齐的团粒状生长特征。

Femoral stress has been studied by electrometric experimental stress analysis methods to know about femoral stress value and its distribution case in front and rear of replacement to artificial femoral head.

结果表明：股骨内外侧应力大于前后侧应力；人工股骨头置换术后股骨头近端应力明显下降；在使用骨水泥固定后，股骨上各点应力无大的变化，而当使用带颈领的人工股骨头时，股骨头近端应力下降受到抑制。

The purpose of this study was to elucidate the role of plasmapheresis in incompatible LDLT.

该研究的目的在于阐明该不相容的LDLT中血浆置换疗法的作用。

Objective To evaluate the effect of using endogenesis exchange solution as a substitute for normal saline to rinse dialyzers and hemodialysis blood tubing.

目的探讨内生式置换液代替无菌生理盐水冲洗透析器的临床应用效果。

Other enumeration problems lead us to the study of orbits of permutation groups.

其它的计数问题引导我们去研究置换群的轨道。

Rh blood; erythroblastosis, fetal; infant, newborn; plasma exchange; blood transfusion

本文对孕妇进行产前血浆置换降低血清中致病性Rh 抗体的效价，对产后患儿采用Rh阳性血代替Rh 阴性血换血治疗，收到满意的疗效。

FDA informed healthcare professionals and patients that the Agency sent letters warning seven pharmacy operations that the claims they make about the safety and effectiveness of their so-called "bio-identical hormone replacement therapy," or "BHRT" products are unsupported by medical evidence, and are considered false and misleading by the agency. The pharmacy operations improperly claim that their drugs, which contain hormones such as estrogen, progesterone, and estriol (which is not a component of an FDA-approved drug and has not been proven safe and effective for any use) are superior to FDA-approved menopausal hormone therapy drugs and prevent or treat serious diseases, including Alzheimer's disease, stroke, and various forms of cancer.

FDA通知医护人员及病人，FDA寄信警告七家药商，因为他们声称制造的产品安全又有效，这种被称为生物贺尔蒙置换治疗(bio-identical hormone replacement therapy，" or "BHRT)的产品是没有医学证据的，产品的说明可能有错和被药商误导，药商不恰当的声称他们的产品含有多种贺尔蒙如estrogen， progesterone和estriol (此成份不被FDA核可且其安全及有效性尚未被证实)优於FDA核可的停经贺尔蒙治疗药物且可预防或治疗严重疾病；包括阿滋海默症（Alzheimer's disease）、中风和许多癌症。

Ethene are mainly adsorbed by p electron interaction with high frequency sites in Cs/HMor.

Cs~+离子置换了低频吸附位SiOH中的氢后，转变为高频吸附中心Si-O-Cs。

Triethylamine and ethyl ether were freshly distilled in nitrogen over potassium before use.

对于 三乙胺和乙醚的蒸馏提纯，是在氮气的保护下进行操作的，烧瓶中，加入乙醚，用氮气保护，置换体系中的空气，然后加入K，回流。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐