Abstract: This paper discusses the test problem concerning ratios of two normal density functions.
摘要：本文讨论对两样本正态分布密度比的假设检验。
The experiment shows: the change of the velocity of sound through normal density alit is regular and directly proportional to the strength of alit;
结果表明：在正常密度水泥石实验中一般声速反应较规则，基本与强度正相关；
The bolls per unit area of cotton leafy shoots retained at low density could reach the same level as cotton leafy shoots removed at normal density.
低密度下留叶枝单位面积成铃可以达到高密度下不留叶枝的水平。
After several years, the inner-belt electron density would return to normal, the model suggests.
该模型显示，几年后，内部辐射带的电子密度将回到正常值。
Most people who suffer hip fractures have normal bone density, but their bones have weakened in ways not detected by bone scans.
有很多病人在股骨折的时候骨密度并没有降低，但是他们的骨骼强度确实下降了，通过扫描还不能检查出来。
Figure 1 shows a typical normal probability density function, so called because most observations fall into this sort of distribution.
图1显示了一个典型的正态概率分布函数，这样命名是因为绝大多数值都属于这个分布范围内。
So different in patients with hypertension, and their total cholesterol and low density lipoprotein in the normal range are not the same request.
所以说不同的高血压患者，他们的总胆固醇和低密度脂蛋白的正常范围要求也不一样。
Any plating must have a can produce normal coating the current density range.
任何电镀都必须有一个能产生正常镀层的电流密度范围。
Therefore, SF6 density relay switch will have a direct bearing on the possibility of normal operation.
因此SF 6密度继电器的好坏直接关系着开关是否能够正常运行。
Experts also cautioned that subtle gender differences in connections can be thrown off by normal disparities in brain size between men and women and in the density of brain tissue.
专家们还警告称，连接方面微小的性别差异会被当成男女大脑尺寸及脑组织密度方面的正常差异而被摒弃。
Figure 1: Normal probability density function, which illustrates that actual observations may vary from the expected (or average).
图1：正态概率分布函数，它表明实际的观测值可能会偏离期望值(或者平均值)。
A normal living organism of ordinary density could not realistically grow to the size of the Cloverfield monster and still be able to support its weight on land.
普通的生物在现实中不可能在长到科洛佛怪兽的尺寸的时候还可以在陆地上承受自己的重量。
The contour currents colliding with the overlapped low density normal seawater can create internal waves of large scale at the interface of the thermohaline.
在等深流与上覆低密度水体之间的界面上具备产生大规模界面内波的条件；
Normal test method is employed to explore the relationship between dry density and optimum water content of coal gangue used in daming.
采用标准试验方法求得筑坝用煤矸石的最大干密度和相应的最优含水量。
Retina displays have a pixel density that's so high, your eyes can't discern individual pixels at a normal viewing distance.
软件翻译：“视网膜显示器具有如此高的像素密度，您的眼睛不能在正常观看距离辨别各个像素。”
In some cases, as the density of the spinal vertebrae decreases, they may lose their normal height.
在有些病例，随着脊椎骨密度的下降，他们的正常身高会下降。
The result shows that the compressive strength at normal temperature of impregnated samples is raised in varying degree, their bulk density is increased and the porosity is decreased.
制得高强度耐火粘土砖的试验结果表明：浸渍处理后的试样，常温耐压强度均获得了不同程度的提高，体积密度增加，气孔率下降。
The ability of the ionosphere to reflect these waves is dependent upon normal variations in the electron density at different levels.
电离层反射电波的能力取决于不同高度上电子密度的正常差别。
The data required in the method are: liquid density, Z_(RA)and vaporization enthalpy at normal boiling point.
本方法所需数据为：液体密度、Z_（RA）值及正常沸点下蒸发焓。
Results: Compared with those of normal cell, the specific surface and numerical density of the mitochondrion and the lysosome in the mid and late stage were decreased.
结果：研究发现癌细胞与正常细胞比较，线粒体和溶酶体的比表面、数密度均减小。
Result The average response density of multifocal electroretinogram in normal subjects was the greatest in the first ring and gradually decreased with the increase of eccentricity.
结果正常人多焦视网膜电图振幅在第一环处反应密度最高，随着离心度增加，反应密度值逐渐降低；
The density of sleep spindle and K-complex were significantly correlated with normal FNE.
睡眠纺锤密度和K综合波密度与正常fne显著相关。
The microvessel density of E21 hippocampus reached a normal level and the blood capillary ultrastructure of P30 hippocampus was restored.
E21海马微血管密度达到正常水平，P 30海马毛细血管结构正常。
The density evolutions of normal bond and tangent bond in micro scale determined different characters of material failure in macro scale respectively.
微观上法向键和切向键的密度衰减分别决定着材料不同的宏观全过程破坏特征。
In this paper, a formula of ground settlement around deep excavation is proposed based on the normal distribution of density function.
本文提出了按正态分布密度函数计算深基坑开挖引起的地表沉降值的公式。
Result: indicate beverage this can reduce blood alcohol density blood viscidity that ethanol cause unusually return to normal in time.
结果表明，该饮料能降低血醇浓度及时乙醇所致的血液粘度异常恢复正常。
We have obtained the electron density distribution in the normal direction of different targets. The time evolution of electron density of Cu plasma has been obtained.
获得了不同靶材料等离子体的靶面法向电子密度分布，以及铜等离子体电子密度的时间演化。
They obey normal distributions. Distributions of power spectral density (PSD) for pressure signal display narrower frequency range and higher amplitude.
压力信号的功率谱密度具有频率波动范围窄、幅值大的特点；
The larger the density, the lower the effective mean normal stress, the more dilative response is.
土的密度越大，有效平均正应力越低，土的剪胀性就越大。
The larger the density, the lower the effective mean normal stress, the more dilative response is.
土的密度越大，有效平均正应力越低，土的剪胀性就越大。
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