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A program with a single loop and a nested loop (presumably loops that execute N times each) is O( N 2 ), even though there is also a O loop present.

程序的单回路和一个嵌套循环（大概循环每执行 N 次）为O （ N 2 ），即使有也是一个为O环本。

However, among students in the elementary schools (n=552), the prevalence of myopia was 22.5%(25/111) in the darkness group, 23.1%(94/427) in the night-light group, and 21.4%(3/14) in the room-light group. Among children in the kindergartens (n=352), the prevalence of myopia was 6.1%(2/33), 13.5%(40/297), and 9.1%(2/22), respectively.

但是在学校组中，国小学童(n=552)的近视罹患率，全暗组为22.5%(25/111)，小灯组为23.1%(94/427)，全亮组为21.4%(3/14)；幼稚园学童(n=352)的近视罹患率，全暗组为6.1%(2/33)，小灯组为13.5%(40/297)，全亮组为9.1%(2/22)；均无统计学显著差异。

N\nPlease verify that your email address is correct\nin your Mail preferences and try again.

n\n请验证您「邮件」喜好设定中的\n电子邮件位址正确无误，然后再试一次。

The relationship between soil microbial number and organic matter, total N, available N, and available P of soil samples, and the ecological effect of soil microbial physiological community participating nitrogen cycle in this area were also discussed.

同时讨论了土壤微生物数量与土壤有机质、全N、有效N和速效P的相关性及微生物生理群在该场区氮循环中的生态作用。

The remaining three groups were given a chemical, N-butyl-N-(4-hydroxybutyl) nitrosamine in drinking water, which induces bladder cancer.

其余三组则获得化学， N -丁基的N -（ 4 -羟基）亚硝胺在饮用水，诱发膀胱癌。

METHODS: By cluster sampling, 214 cadets from a military academy were investigated with Modified Big Five Personality Scale and selfdesigned decisionmaking scale. The cadets were randomly divided into 2 groups. After noneffective questionnaires were eliminated, the first group (n=110) were in a positive framing and the second group (n=104) in a negative framing. A chisquare test was used to analyze the results of program chosen and t test was used to determine the relationship between personality dimension and risky choice.

采用自编决策问题问卷和大五人格量表中国修订版，以整群抽样的方法，抽取某军校大学生220人为研究对象，随机分为两组，剔除无效问卷后，正面框架组(n=110)，负面框架组(n=104)，对两组间被试的方案选择进行χ2检验，方案选择与人格特征的关系进行t检验。

The new water-soluble reagent N―Nonyl―N＇―Sodium p-Aminobenzenesulfonate Thiourea NPT was synthesized and its structure was confirmed by elemental analysis,IR, UV and1 HNMR spectra.

合成了水溶性的新试剂N―壬基―N＇―氨基对苯磺酸钠硫脲NPT，经元素分析、IR、UV、1HNMR测试，确定了其结构。

N, N-Dimethylformamide is a kind of organic solvent with low noxiousness.

中文摘要：二甲基甲酰胺(N，N-dimethylformamide，DMF)是一种低毒类有机溶剂，主要应用于萃取、有机合成、染料、纤维、皮革、制药等工业。

It is worthy to mention that the extracted nucleon density distributions of 〓N and 〓N by this method are not sensitive to the model parameter.

值得指出的是，用本文方法提取的〓N、〓N核子密度分布，对所用理论模型参数十分不灵敏。

In order to test our model, we also give an analysis of the lowest excited states N*(1520) and N*(1535) of nucleon. with negtive parity.

为了进一步检验我们的模型，本文还在推广的手征SU(3)夸克模型下计算了核子最低负宇称激发态N~*(1535)，N~*(1520)的能量。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。