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In some important cases, if the experiment is repeated many times, the variations in the results are found to be distributed according to a particular mathematical law –the normal error law.

在一些重要的情形中,如果多次重复一个实验,会发现其结果的变化按照某个特定的数学法则——正态误差法则分布。

Decreasing the gravidity and the times of curettage、avoiding delivery out of hospital and better supervision of antenatal care in the community studied are recommended to reduce obstetric hemorrhagic shock cases.

结果:产科失血性休克的发生率为0.65%,胎盘因素是失血性休克的主要原因;主要的危险因素是多次妊娠和流产、院外分娩及重度子痫前期。产科失血性休克导致的子宫切除率为17.6%。

Results of XRD,SEM,and UV-Vis indicated that ZnS nanocrystals can grow in and fill in the void of opal template,and SiO2 microspheres of templates are dissolved so as to form some three dimensional ordered porous structure and to form the inverse opal ZnS photonic crystals. Compared with opal templates,ZnS-opal and inverse opal ZnS photonic crystals assembled with SiO2 spheres in the same diameter show good optical properties and exhibited photonic band gap. The photonic band gap position of inverse opal ZnS moves towards UV area compared with opal and ZnS-opal.

结果表明:溶剂热法多次充填可使ZnS纳米晶在模板密堆积形成的空隙中均匀成核;经过酸处理的ZnS-opal中SiO2微球溶解、坍塌,形成蜂窝状三维有序介孔和反opal结构ZnS基光子晶体;相同粒径SiO2微球组装的opal模板、ZnS-opal以及反opal结构ZnS光子晶体均表现出光子带隙特性,但反opal结构ZnS光子晶体带隙位置相比前两者发生了蓝移。

Through trial and error, piron mastered the grapefruit tree rings, cutting method to technical training for orchard, on-the-spot guidance two agricultural enterprises and farmers cut part adopts loop technique, make one year earlier results, grapefruit, fruit-set rate increase production, realizing the early, Summarizes the grapefruit organic methods, fully in the stable yield, improve the quality of grapefruit.

通过反复试验,刘强掌握了柚树环割的方法,多次到果园进行技术培训,实地指导两个农业企业和部分农民采用环割技术,使柚子提早一年结果,座果率大幅度提高,实现了早结、丰产;总结了柚子完全施用有机肥的方法,在稳定产量的同时,提高了柚子质量。

Comparing the results of different models, th e average temperature calculated by the polynomial curve model was with high precision.

对各种平均温度的计算结果进行比较可知,基于内能的多次曲线计算模型具有较高的计算精度。

Through several years' field observation and through the comprehensive analysis on fossils identification, rock geochemical test result and rock property, it is shown that the late Paleozoic radiolarian silicalite and its rock combination are a suite of oceanic basin abyssal facies deposition, and the Bazukeng Formation of Dengshan Group is a suite of early Paleozoic neritic continental shelf bathyal facies deposition.

经数年野外多次观察和对室内化石鉴定、岩石地球化学测试结果以及岩石学特征的综合分析表明,所发现的含晚古生代放射虫硅质岩及其岩石组合是一套洋盆深水相沉积;登山群拔竹坑组,是早古生代的一套浅水陆棚-深水陆棚-半深海相沉积。

Finally,a simple simulation application was illustrated,by analyzing and comparing of the result,when subcontract supplier selection is long-term and it is carried out repetitiously,the method is good at inspiriting subcontract supplier to cut down price and improved service quality at the same time.

最后,利用一个简单的实例进行试验,结果分析和比较表明,当分包商选择是长期的且分阶段多次进行时,该双层规划模型能很好的激励分包商提高服务质量,降低分包价格。

The system has good performance of both transient state and steady state.

结果表明,本文提出的冷量回收汽车空调系统很好地实现了LNG冷能的分级回收,通过天然气的多次循环实现了LNG自身汽化。

Methods the diagnosis situation of 19 cases of cryptococcal meningitis who have been confirmed from 1980 to 2004 are analysed.results there are 17 misdiagnosis cases in 19 patients, of which 7 cases are tubercular meningitis,3 are viral meningitis,2 are brain tumor,1 is cerebral edema,1 is arachnoiditis of brain and 2 are others.conclusion misdiagnosis can be discreased by promoting learning about cryptococcal meningitis, examining the doubtful patients' csf frequantly and another examinations.

对本院1980—2004年确诊的19例新生隐球菌脑膜炎病人的诊断情况进行回顾分析。结果 19例确诊前有17例被误诊,其中误诊为结核性脑膜炎7例,脑肿瘤2例,病毒性脑膜炎3例,脑水肿1例,脑蛛网膜炎1例,红斑狼疮脑病1例,其他2例。结论提高对新生隐球菌脑膜炎的认识,对可疑病人多次做脑脊液墨汁涂片检查,或其他检查,可减少误诊。

The later can research basic inner process inner mass flow and diathermanous mechanism of components, and apply to use in actual operation process of system's components, emulation of dynamic characteristic and performance's optimized analysis of components.

第3章 建立了风机盘管的稳态模型,通过产品的多次实验平均结果验证了模型的正确性;并对风机盘管的调节和节能进行了模拟和分析。

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推荐网络例句

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性,但我大喊,并在他们的方向扔石头让他们过的线索,远离我,以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。

Store this product in a sealed, lightproof, dry and cool place.

密封,遮光,置阴凉干燥处。