精密度

In particular, the impact of various accessories, with imports of all kinds of special-shaped teeth slotted knife and tool steel single-pole/double-throw front, high-precision machine-cut Slitting blade Wenmingquanguo series, the products are sold throughout the country and exported overseas.

尤其冲击的各种配件、进口带齿开槽刀各种异形工具以及锋钢单刀、高精密度纵剪机分切系列刀片闻名全国，产品销往全国各地并出口海外。

In particular, Xiao impact of the various accessories, with imports of all kinds of special-shaped teeth slotted knife and tool steel single-pole/double-throw front, high-precision machine-cut Slitting blade Wenmingquanguo series, the products are sold throughout the country and exported overseas.

尤其冲击肖的各种配件、进口带齿开槽刀各种异形工具以及锋钢单刀、高精密度纵剪机分切系列刀片闻名全国，产品销往全国各地并出口海外。

Slitting imports of high-precision machine circular knife, following sets, pouches and CBN grinding wheel, alloy steel ultra-thin, high-speed steel knife-cut round, Shaped like knives and, in particular, Xiao impact of the various accessories, with imports of all kinds of special-shaped teeth slotted knife and tool steel single-pole/double-throw front, high-precision machine-cut Slitting blade Wenmingquanguo series, the products are sold throughout the country and exports Overseas.

高精度进口纵剪机圆刀，隔套，胶套及CBN砂轮，超薄合金钢，高速钢分切圆刀，及各异型类刀具，尤其冲击肖的各种配件、进口带齿开槽刀各种异形工具以及锋钢单刀、高精密度纵剪机分切系列刀片闻名全国，产品销往全国各地并出口海外。

Manna sugar potentiometric method has been used to determine the boron in foliage spray fertilizer which contained the humic acid.

甘露醇电位滴定法测定含腐植酸叶面喷施肥中硼的含量，用酸度计来指示滴定终点，不需对样品进行处理，方法操作简单，精密度、准确度较高，相地标准偏差小于 1%，回收率在 97%以上。

Chlorine in the sample solution was indirectly determined by mercury thiocyanate spectrophotometry. The results are in good agreement with those from other methods with precision of 1.74%RSD (n=6) for the sample with 1.08% chlorine.

方法用于实际样品的分析，结果与其他方法测定值一致，误差均在允许范围内；对氯含量为1.08%的样品重复测定6次，精密度为1.74%。

Results: The four linear calibration curves were obtained over the range 0.025μgml^(-1) to 3.2μgml^(-1) of amphetamines (amphetamine, methamphetamine, MDMA, MDA) in urine (r=0.9977-0.9998). The recoveries of the assay were better under different concentrations and the lowest concentration of detection reached the level of nanogram.

结果：4种苯丙胺类药物在尿药浓度为0.025-3.2μgml^(-1)范围内标准曲线的线性关系良好(r=0.9977-。09998)；高、中、低3种浓度各标准药物的回收率较高；日内、日间精密度的BSD基本符合小于10%的要求；最低检测浓度能够达到纳克级，具有较高的灵敏度。

Phthalic acid esters are widely used in the many fields of industry. So many countries including China have come to pay attention to them and make up the codes for limiting the content in some products such as textile. By combining international codes, the thesis selects coating and textile that have close relative with people as objections. The research results are as follows:1. The thesis has established the textiles preparation method by a series of experimentations such as extraction solvent, extraction time, solid-phase extraction. The average recoveries of eleven phthalates are from 80.30% to 98.00%, and the relative standard deviations from 0.59% to 2.56%, the results show that this method is accurate and credible.2. The thesis set up the simultaneous determination of benzene, toluene, xylenes and phthalates in coatings.

邻苯二甲酸酯类化合物被广泛地应用在工业领域的各个方面，国际上已经开始重视邻苯二甲酸酯作为一种内分泌干扰素的危害性，对在一些产品中的用量作出了限制，但没有具体的分析测定方法，本论文结合国际法规选择了与人们生活密切相关的涂料和纺织品来研究其中邻苯二甲酸酯类环境激素的测定方法，研究内容如下：(1)通过对提取溶剂、提取方式、提取时间的选择实验以及固相萃取的一系列条件实验，首次建立了纺织品中测定邻苯二甲酸酯类环境激素的前处理方法，并对分析方法作了准确度、精密度验证。

The average recoveries of benzene, toluene,-xylenes, o-xylene are from 97.21% to 103.10% and the RSDs are from 0.12% to 0.95%. And the average recoveries of Phthalic acid ester are from 96.01% to 102.02% and the RSDs are from 0.92% to 2.46%.

2采用PTFE膜过滤前处理法，首次建立了涂料中苯系物和邻苯二甲酸酯类环境激素的同时测定方法，并对分析方法作了准确度、精密度以及实验室间验证。

Precise cutting of copper and aluminum sheets is a systematic work with the cutting toolings and machines as the most important factors.

铜铝薄板的精密裁切是一个系统工程，其中刀具和分条机是提高铜铝薄板裁切精密度的首要因素。

If three titrations do not result in the desired precision, it will be necessary to

如果三份滴定的精密度达不到要求的话，将需要进行额外的滴定。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。