醚的

Chen et C.Ling,20 times amount of petroleum ether,refluring for 2 h,and extracting 3 times.

结论该法的最佳工艺为：过325目筛温莪术微纳米粉体，加20倍质量倍数的石油醚，回流2 h，提取3次。

Its main insecticidal active components were weak polar matter and mainly distributed in the polarity range of petroleum ether.

不同极性萃取物的活性比较得知，杀虫活性成分主要是酯溶性的弱极性物质，分布在石油醚所在极性范围内。

The properties of light fractions (including naphtha, jet fuel and light hydrogenated lube base oil) from the 300 kt/a lube isodewaxing unit of SINOPEC Shanghai Gaoqiao Company were reviewed and a proposal for optimizing utilization of these fractions was presented, such as producing AR petroleum ether from naphtha; superior odorless kerosene and rolling oil of aluminum foil from jet fuel fraction; transformer oil, high quality white oil and jelly wax from light base oil fraction.

对中国石化上海高桥分公司300kt/a润滑油异构脱蜡装置生产的石脑油馏分、喷气燃料馏分及轻质加氢基础油性质进行试验分析，提出合理的利用方案，其中石脑油馏分可生产分析纯石油醚，喷气燃料馏分可生产特种煤油与铝箔轧制油，轻质加氢基础油可生产变压器油、高档白油以及果冻蜡。

A quantitative size exclusion chromatcgraphic method was developed for studying the complexation reaction between a biscrown ether and potassium picrate in tetrahyrofurane.

用定量的体积排除色谱方法。研究了双冠醚和苦味酸钾在四氢呋喃中的配合反应。

The effect of plasticizer on the ionic conductivity of the polyurethane was also investigated.

为了提高聚合物的机械强度、降低玻璃化温度，合成了交联的聚醚聚氨酯。

Methods The activitie of anti-lipidperoxidation of Chinemys Plastrum Testudinis of petroleum-ether, acetoacetate and 95% alcohol solution from two producing areas was studied by DPPH.

方法采用DPPH法分别测定两种不同产地龟板的石油醚、乙酸乙酯、95％乙醇等不同极性溶剂提取物的抗氧化活性。

More influence of WHSV on activity was observed over smaller pore catalysts.

3催化剂的有效孔径越大，醚化活性受空速的影响越小。

With increasing the aging time at 200 ℃, the stress relaxation rate decreased pronouncedly, while the yield strength, the density, and the excess enthalpy loss increased markedly within the first ten hours.

研究了聚芳醚酮在200℃下长时间放置过程中的密度，热焓，屈服及应力松弛行为随时间的变化规律。

In addition to the regular use of a vacuum cleaner suction carpet dust can also be used ethers of Pyrethrin pesticide spraying in the carpet, or cotton cloth dipped in turpentine carpet.

经常用吸尘器吸除地毯上的灰尘，还可以用除虫菊酯醚类的除虫剂喷洒在地毯上，或用棉纱蘸松节油擦拭地毯。

The rheological properties of poly with different molecular weight have been measured using cone/plate rheometer.

用锥板流变仪测试了分子量不同的国产聚醚砜样品的流变性能。

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。