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Material and MethodsRA Rabbit Model group: 15 early RA rabbits of the same weight and variety Control group:10 normal rabbits of the same weight and varietyMethods of making RA rabbit model:elect 15 normal rabbits of the same weight and variety, dissolve Ovalbumin in 0.9% sodium chloride solution, to make the solution of 20mg/ml concengtration, blend the same quantity of complete Freund′s Adjuvant equably ,inject the mixed solution into endermic tissue of the rabbit′s scapular section, making the rabbits allergic, inject 1 ml of the mixed solution to one rabbit every time, inject 1 ml of the mixed solution in 5 different places of the rabbit′s scapular section, inject the rabbit one time every week,inject 3 weeks continuously,it turned out to be that the rabbits will be allergic, inject Ovalbumin blent with the 0.9% sodium chloride solution into the knee joint cavity of the rabbits in the fourth week, 5 mg Ovalbumin every knee joint cavity,two knees of every rabbit of the 15 rabbits are both injected,the arthrosis diameter and the exterior temperature of the knees will be added obviously in 24 hours,and they will drop gradually,at the time of the 14th or 21th day, the arthrosis diameter and the exterior temperature of the knees will get to the balance time,the incidence rate of RA is 100%.after the RA model succeeds,it is the early time of RA from the first week to the fourth week,after the fourth week,it is the late time of RA, the cartilage of the femoral condyle and the subchondral bone cortices will be changed unrecoverily.
资料与方法RA模型组：早期RA家兔模型15只，品种及体重接近。对照组：正常家兔10只，品种及体重接近。RA家兔模型制作方法：选取15只成年家兔，体重、品种接近，将卵蛋白溶解于生理盐水，配成浓度为20mg/ml的溶液，与等量完全弗氏佐剂混匀，注入家兔肩胛区皮下致敏，每只家兔每次注射1ml，于肩胛区5个不同区域注射，每周一次，连续注射3周而致敏，第4周向膝关节腔注射卵蛋白生理盐水溶液，每只关节腔注射5mg卵蛋白，15只家兔膝关节全部注射，24h内此关节直径和表面温度大幅度上升，以后缓慢下降，至14～21d达到平台期，发病率达100%。造模成功后第1～4周为早期改变，第4周以后出现不可逆的关节软骨及骨破坏。采用高频超声对RA模型组与对照组的膝关节髌上囊液体厚度、滑膜及股骨髁软骨厚度及软骨下骨皮质的回声情况进行对比观察。结果RA组模型组膝关节髌上囊积液及滑膜的厚度明显厚于对照组，其股骨髁软骨的厚度与对照组相比无明显差异，其软骨下骨皮质与对照组相比无明显改变。
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RA was observed to have a tendency towards family aggregation, as the morbidity of RA was up to 30% in monovular twins, 5% in non-identical twins, which demonstrated the occurrence of RA associated to genetic factors.
有研究发现RA有家族聚集倾向，单卵双生子发病率为30％，双卵双生子为5％，说明RA发病与遗传因素有关。
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It is suggested by our test work on radon mapping of geology that there is a good coincidence between the data got from gamma-ray spectrometer and radon monitor and the U、Th、Ra、K data got from indoor gamma-ray spectrometer and radiochemistry method; the data of gamma-ray spectrometer and radon monitor are also comparative to the 1∶20 ten thousand geochemistry data of U、Th、 Ra (calculated by the equilibrium coefficient between U and Ra) and radon concentrations measured by solid state nuclear track detector .
在国内首次利用地质勘探费用进行氡地质填图方法试验，该试验方法结果表明，利用国产的现场能谱仪、测氡仪获得的数据与室内能谱仪、化学法测得的铀、钍、镭、钾结果一致；与已有的1∶20万区域地球化学数据铀、钍、镭（由铀、镭平衡系数计算得出）、钾和固体核径迹累积法测氡数据具有很好的可比性。
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contador,ra：会计
校长:director,ra; rector,ra | 会计:contador,ra | 厨师:cocinero,ra
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RA Radio Astronomy：射电天文学
RA Radio Astronomy 射电天文学 | RA Random Access 随机存取 | RA Rate Adaptation 速率索赔
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RA Read Amplifier：读放大器
RA Reachability Analysis 可达性分析 | RA Read Amplifier 读放大器 | RA Real Address 真实地址