醚的

It is impossible to establish one method to applying for all of pesticides and samples, so different methods are introduced to analysis different categories of pesticides, according to different physico-chemical properties.11 Organochlorine Pesticides are detected by GC-ECD and extracted with 50ml acetone and 100ml petroleum aether in Solxhlet's extractor clean-up with oil of vitriol.

农药种类繁多，结构各异，建立一种方法适用于所有农药和样品难度极大，本文将常用农药按分子结构分为四类分别建立检测方法：采用索氏提取器，丙酮/石油醚(50：100，V：V)混合溶剂提取、磺化法净化、GC-ECD检测研究了11种有机氯农药在蔬菜、水果、粮食中残留，结果显示11中有机氯农药在五种样品上的5次重复平均回收率，从添加0.005到2.000mg/kg的回收率范围为92.4%—103.7%，平均回收率大于80%，变异系数范围在1.16—9.16%之间。

The effect of temperature(291K-313K) on the thermodynamic behavior of two racemic glycerin selenides on CDMPC chiral stationary phase was investigated with a mobile phase consisting of n-hexane/2-propanol(80/20,v/v).

在流动相组成为正己烷/异丙醇(80/20，v/v)，温度为291K-313K条件下，考察了2种结构相似的外消旋硒代甘油醚色谱手性拆分的热力学行为。

Age resisters can effectively improve the properties of ageing resistances of polyether-co-ester s.

用η＿／c，拉伸性能，扫描电镜及DTA等研究了以PEG为一组分的共聚醚酯在日晒牢度计中的老化规律。

The relations between the amount of the agent and crosslinking degree, mechanical property, heat resistent,thermal stability and pyrofluxibility were studied in detail.

通过熔融反应、模压和注射成型，研究了热可逆交联剂DCPD_2及其盐与聚氯乙烯的交联反应时，交联剂种类与用量、催化剂种类与用量、助催化剂聚醚分子量大小对交联程度、力学性能、耐热性与热稳定性、流动性能等的影响。

In order to improve the characterization of polys further, and fulfill the requirement of some extreme environment like the high temperature and irradiation environment, it is made them to take place crosslinking reaction.

为进一步提高聚芳醚酮类聚合物的性能，满足某些特殊情况下的使用要求，可考虑对它们进行交联。

These results show that desflurane affects the expression of adhesion molecules involved in the multistep process of neutrophil recruitment.

这些结果提示地氟醚影响细胞粘附分子表达作用在牵涉到中性粒细胞的再聚集的多个阶段。

According to the different content can be polymer powder, cellulose ethers, fly ash, water reducer different configuration of the self-leveling mortar.

根据所采用不同掺量的可再分散乳胶粉、纤维素醚、粉煤灰、减水剂配置不同的自流平砂浆。

The physicochemical indexes of the seed oil extracted by petroleum ether were as follows: relative density 0.9374 d(superscript 20 subscript 4, acid value 8.49 mgKOH/g, iodine value 64.47 gI/100 g, peroxide value 4.92 mmol/kg, saponification value 196.63 mgKOH/g.

结果表明：三叶木通籽粗蛋白含量为34.39%，粗脂肪含量为31.37%，经石油醚提取出的三叶木通籽油的相对密度0.9374d(上标 20 下标 4，酸值8.49 mg/g，碘值64.47 g/100 g，过氧化值4.92 mmol/kg，皂化值196.63 mg/g。

This paper mainly discusses the difficult points of the sticking technology of high temperature resistance fluoro-aether rubber.

阐述了耐高温氟醚橡胶粘接的难点，分析了传统工艺的缺点。

Product is tetrafluoroethylene - perfluoroalkyl vinyl ether polymer resin by extrusion, blow molding expansion of heat shrinkable tubes, heat shrinkable tube temperature is -80 ℃~ 260 ℃, shrinkage temperature of 180 ℃-250 ℃, the general shrinkage of 30%, it has no viscosity, heat, weathering, corrosion resistance, anti-fouling, and high electrical insulation properties, is a steel bar rubber and silicone rubber coated roll the ideal casing, may be extended roller life, reduced wear and tear, widely used in chemical industry, electroplating, pharmaceutical, printing, papermaking and other fields.

本产品由四氟乙烯－全氟烷基乙烯基醚聚合物树脂经挤出、吹胀成型的热收缩管，热收缩管使用温度为-80℃～260℃，收缩温度为180℃-250℃，收缩率一般为30%，它具有不粘性、耐热、耐候、耐腐蚀、防污和电高绝缘性能，是钢棒橡胶和硅橡胶辊理想的包覆套管，可延长辊筒寿命、减小损耗，广泛地应用在化工、电镀、制药、印刷、造纸等领域。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。