距离

Near vision habits that influenced the onset of low vision included reading distance, distance of television, interclass activities, reading more than an...

结论看书距离和看电视距离越远是视力低下的保护因素，课间活动少、连续看书1小时以上是视力低下的危险因素。

Followed by the decomposition phase is optimal feature subset selection, in which the optimal feature subset acquired the best divergence is obtained according to interclass/intraclass distance of the training samples. This procedure is implemented by a Genetic Algorithm, with each possible feature subset encoded as chromosome. Fitness scores in GA are calculated and evaluated based on Jeffries-Matusita distance of the selected training samples.

然后，对这些线性光谱特征利用遗传算法结合训练样本计算类内/类间距离搜索最优分类子集，其具体染色体编码取可能的特征号，适应度函数基于样本平均Jeffries-Matusita距离计算。

The radiographs were transferred into a computer and calibrated and measured with the image J software. The following factors were measured : [1] the distance from the base of the contact point to the bone crest. [2] The length of the interproximal dental papilla. [3] The width of keratinized gingiva. [4] The interdental distance.

使用测量软体计算距离，并评估下列各项影响齿间乳突存在与否的因子，包括：[1]牙齿接触点到齿槽骨嵴的距离；[2]齿间乳突的长度；[3]齿间角化牙龈的宽度；[4]牙齿间距。

When this technology is ap-plied to the exchange network where interoffice and loop distances are generally much shorter than the maximum achievable repeater spacing, there is excess optical power to be exploited.

此项技术如用于交换网，其局间和环路距离一般比可实现的最大中继距离短得多，因而有多余的光功率可以利用。

The Baroque interpenetration of man and nature was now replaced by a separation,thus establishing the distance between man and nature which was a prerequisite for nostalgic contemplation.

巴洛克风格人与自然的融合现在被分离取代，从而建立人与自然的距离，这个距离是怀旧沉思的前提。

It was found that the practical value of the relative intensity of ultraviolet radiation in the radiation distance of 50 to 100 cm was conincident with theoretical one calcuIated by the square inverse ratio law. In the radiation distance of 25 cm, the practical value was less than theoretical one.

但实际上治疗用的紫外线灯管多为U型灯管，光照强度与光源距离的关系是否仍符合平方反比定律曾有不同意见，为此我们进行了紫外线照射距离改变对强度影响的测试。

According to the division principle of flue gas sampling point in round stack,the paper gives a convenient and prac-tical formula of the dixtance from sampling point to inwall and corrects the errors in table of the distance value from sampling point to in wall in the published literatures.

本文根据圆形烟道采样点划分原则，给出了一种方便适用的采样点距烟道内壁的距离公式，并就现有文献中采样点距烟道内壁的距离值表格的误差进行了修正。

Proportion --Measuring from the breastbone to rear of thigh and from the top of the withers to the ground, the Irish Setter is slightly longer than it is tall.

比例：从前胸到大腿后面的距离与马肩隆到地面的距离相比，体长略大于肩高。

So this paper shows an effective method based on an idea that uses motion compensation, general second-step keystone transform twice and at the same time, finds an isolated point and adopts WVD transform to estimate Doppler parameters for removing range walk and curvature. And what is more, the detailed deductions are given in this paper.

该文提出了一种基于利用运动补偿并两次利用广义二阶keystone变换同时结合利用孤立的散射点进行WVD变换估计多普勒参数的方法来分别消除距离弯曲和距离走动并最终对舰船成像。

In this paper was obtained minimum point of sums of distances to isosceles triangle certainly was in median line of base of the triangle,and minimum point of quadratic sums of distances to every vextex in general triangle just was bara-center ofthe triangle.

对等腰三角形，得到了到各顶点距离之和的最小值点必在底边的中线上；对一般的三角形，获到了到各顶点距离平方和的最小值点就是三角形的重心。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐