本文对主经圆定理给出了一个简练的解析证明，并且在此定理的思想基础上，得到了椭圆上法线的两个性质定理。
This paper has given a pithy analytic Proof of "principal diameter circle"Theorem. And on the basis of the thought of the theorem. We obtain two theorem about ellipse normal.
员工账号相当于员工的个人账号，用于项目协同工作，经主账号授权可进行图纸上传和下载等操作。
Employee account is the personal account of the employee for coordination of projects and can upload and download plans subject to authorization of the main account.
目的：探讨经纤支镜高频电刀灼烧扩大管腔并放置金属支架治疗左主支气管结核性狭窄的疗效和安全性。
Objective: To investigated the curative effect and safety of treating left main bronchial tuberculous stenosis by means of radio knife burn through fibrous bronchoscope and placement of metal stand.
因为经上记着说：‘当拜主你的神，单要事奉他。’
For it is written: Worship the Lord your God, and serve him.
起重机小车轮压经轨道传给箱形主梁上盖板和腹板，使之产生局部应力。
The local stress in the box beam is caused by the wheel pressure of the trolley conveyed along the track onto the upper flange and the web of the beam.
中医官窍-脏腑理论、官窍-经络理论、脑主七窍理论都论证了经鼻治疗脑血管疾病的可行性。
RESULTS Chinese medicine organ-viscera theory? Organ-meridian? And brain main organ theory all demonstrated the feasibility of the treatment of cerebrovascular disease through nose.
经计算主测定路线上的通风阻力测定相对误差为1.94%，其精度符合要求。
The relative error of the ventilation resistance measured on the main measuring route was 1.94% and the accuracy could meet the requirement.
二滩水电站已全部投运的6台机转轮经停机检查，现场焊接的主焊缝无裂纹。
The runners of 6 operated generating unit of Ertan Hydro Station have been checked and no crack on the primary weld of the field welding position is observed.
经聚丙烯酰胺凝胶电泳分析，细胞的酯酶同功酶带为12条，其中有6条主带。
The esterase isozyme exhibited 12 isozyme bands by PAGE with 6 major bands.
结果表明：经采用微弯型整治方案后，游荡型河段的主溜平均摆动范围逐渐减小，河流稳定性明显提高；
The outcomes show that a) the mean wandering range of the main flow reduces gradually and the stability of river increases remarkably after adopting a correction plan with slight-curves;
如经上所记：“谁曾知道主的心意，能够指教他呢？”但我们已经得着基督的心意了。
For, "Who can know the Lord's thoughts? Who knows enough to teach him?" But we understand these things, for we have the mind of Christ.
结果与结论任脉的经气流注方向应该是由下向上，符合十二正经“阴主升”的规律。
Result and Conclusion: The flow direction of Conception Yessel should be upward, it coincides with the twelve meridians' law of"Yin governs ascend".
结果与结论：任脉的经气流注方向应该是由下向上，符合十二正经“阴主升”的规律。
Results and Conclusion:The flow direction of Conception Vessel should be upward, it coincides with the twelve meridians' law of "Yin governs ascend".
经纸层析，醋酸纤维素薄膜电泳及琼脂糖电泳分析表明，其主成分为单一斑点。
It showed a single spot when identified by means of the paper chromatography, cellulose acetate electrophoresis and agarose electrophoresis.
经对断口的宏观分析、起重臂的力学计算，以及对起重臂的工作受力状态和安全性的讨论，最后判定断裂是由于主臂构造缺陷和疲劳所致。
Macro check on the breaking section and mechanics calculation of the jib are performed. The force status and safety of the jib are also discussed.
经对断口的宏观分析、起重臂的力学计算，以及对起重臂的工作受力状态和安全性的讨论，最后判定断裂是由于主臂构造缺陷和疲劳所致。
Macro check on the breaking section and mechanics calculation of the jib are performed. The force status and safety of the jib are also discussed.
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