The red blood cells of a normal person , for instance , age and die in 120 days . new blood cells are formed in bone marrow cells to ensure normal functioning of the human body . however , a vitamin b12 deficiency can make the red blood cells dysfunctional or prevent their successful formation , which in turn causes megaloblastic anemia anemia in which abnormally sized red blood cells are found in the blood . in some cases , prolonged vitamin b12 deficiency can deter the formation and functioning of myelin , subsequently leading to neuritis inflammation of the nerves or incomplete brain development 例如，人类正常的红血球每120天便会老化死亡，所以骨髓细胞会持续产生新的红血球，以维持人类正常之身体功能，所以如果缺乏维他命b12 ，便容易造成红血球生合成功能不全，进而导致巨大型红血球贫血megaloblastic anemia又例如，因长期缺乏维他命b12 ，会造成神经髓鞘myelin生合成功能不全，进而导致神经炎及脑部发育不全等等。
Janos pach and rom pinchasi ( see [ 61 ] ) proved that any set of n points in strictly convex position in the plane has at most [ 2 ( n - 1 ) / 3j triples that induce unit triangles ( equilateral triangles of side length one ) , and any set of n points in convex position in the plane has at most n - 2 triples that induce unit triangles 平面中任一处于凸位abstract置的二一点集至多有2 。一4个三元组满足:每一三元组均导出一个与t0全等的三角形.定理2 . 2 .给定一等腰直角三角形t0 ，平面中任一处于强凸位置的n一点集至多有二个三元组满足:每一三元组均导出一个与几全等的三煮形
Instead , to take advantage of java s support for static typing and the advantages of tools that recognize those types and provide features such as code completion , a java framework would start with a working model and use java s reflection and the excellent jdbc api to dynamically force that model out to the database 相反，为了利用java对动态类型化的支持（以及利用认识这些类型并能提供代码补全等特性的工具） ， java框架可能需要从模型开始，并用java的反射和出色的jdbc api动态地把模型归到数据库上。
Analysis on the total amount control system implementing process in china , its difficulty and problems caused by the deficiency of legal norm , sequential stipulation , feasibility , whole content and complete set law etc , and description on enhancement of legislation of total amount control system , establishment of “ total amount control acts ” , ascertainment of total amount control model , perfection of payable transfered mechanism and complete set system , and legal sanction on violated behaviour were presented 分析了我国总量控制制度实施过程中，因有关的法律法规少、效力层次低，缺乏程序性规定、可操作性差，内容不全面，配套法规不全等而产生的困难和问题，阐述了强化总量控制制度的立法，尽快制定《总量控制管理条例》 ，确立总量控制模式，完善指标有偿转让机制，完善配套制度和对违法行为的法律制裁等方面的需求。
Secondly , the article discusses present conditions of investigation cooperation in china in legislative and judicatory perspectives and points out various questions existing in practice , such as regional protectionism , institutional obstacles etc . part : the institutional study on the perfection of investigation cooperation in china 其次对我国侦查协作的现状进行评析。论述了我国公安机关侦查协作的现行法律规定及运行现状之后，指出我国当前侦查协作运行存在的问题，包括地方保护主义，无偿协作原则、机制阻碍、协作区设定不合理、协作责任规定不周全等问题。
Heating centralized is an important thing in the north . whether this is implemented in a large scale has contributed to impove city modern level and ameliorate atmosphere environment . the traditional heating system are two - upright - pipe - parallel system , two - pipe system , single - pipe - stride system etc , whose calculation for heat charge is either by man or by ic installed on the caliduct . therefore , the problem arise that heat provided does n ' t accord with heat charge payed , not secure , and resident have to suffer much 传统的供暖系统有双立管水平式系统、全双管系统、单管跨越式系统等，其计费方式要么为人工计费，要么是利用安装在暖气片上的带电读卡器，这样存在着供热量与收费额匹配不准确、不安全等方面的问题，也使集中供热用户有苦难言。
[ 61 ] also gives some results about general triangles . in chapter 2 , we focus on isosceles right triangles . at most 2n - 4 congruent isosceles right triangles can be induced by a set of n points in convex position , in strictly convex position at most n congruent isosceles right triangles can be induced , and the two bounds are tight 此外，对于一般等腰三角形的情形，我们有定理2 . 3 .给定一等腰三竟形t0 ，平面中任一处于凸位置的二一点集至多有2rc一2个三元组满足:每一三元组均导出一个与几全等约三盒形
However , it is too expensive in investment , complex in experimental techniques , difficult and dangerous in performance . in this paper to overcome these drawbacks , the similarity relations together with a new method and its principle of experiment have been developed based on the model theory of structural similarity . according to this principle , the total stress ; an be obtained as a sum of the stresses due to weight and external loading , which based on only one model experiment without any gravitational loading 最后，针对外载与自重共同作用下，传统光弹性分析法中采用离心力场模拟重力场获得自重应力的试验投资耗费大、技术复杂且难度大和不安全等严重缺点，按照结构相似的模型理论，本文提出模型外载与自重并存变动外载的光弹性分析法，导出处理这个问题具体的相似律和试验原理及方法，进行了典型实验验证，指出仅用外载作用的模型试验，即不用离心力场模拟重力场的模拟试验，就可以获得上述两种载荷共同作用下的应力分析结果。
We say that the figure f fits in the target t , or , equivalently , the target t covers the figure f , when there is a rigid motion ( an isometry of the plane ) so that ( f ) t , i . e . , if t has a subset congruent to f . it might happen that a specific figure f and target t are given , and one wants to know if the figure fits in the target 如果t含有与f全等的子集，则称f嵌人t或t覆盖f对任意给定的f和t ，判定f是否嵌入t这类问题称为嵌入问题给定一集族f和一目标集t ，寻找能覆盖住f中任一元的t的最小相似图形这类问题称为覆盖问题
According to the characteristics of fh - ocdma system , an upper bound on the size of spread spectrum codes with good performance in autocorrelation and cross - correlation is deduced . then , the quadratic congruence - hop codes that achieve this bound are presented in conformity to the quadratic congruence codes 从fh - ocdma系统的扩频特征出发，推导出具有良好相关性能的扩频码所能达到的最大码容量，并以二次全等码的构造方法为基础，提出了具有良好相关性能和最大码容量的二次全等跳频码的构造方法。
