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Objective A multiresidue method based on solid-phase extraction andgas chromatography with electron capture detector was developed for thesimultaneous determination of 15 pesticides (Dichlorvos, Dimethoate,Parathion-methyl, Malathion, Parathion, Fenpropathrin, Lambda-cyhalothrin,Cypermethrin,Esfenvalerate,Deltamethfin,Quintozene,Dieldrin,Heptachlor,α-Endosulfan,β-Endosulfan) in drinking water.

目的:建立同时检测饮用水中15种农药残留的固相萃取-气相色谱分析方法,所检测的农药包括5种有机磷:敌敌畏,乐果,甲基对硫磷,马拉硫磷,对硫磷;5种有机氯:五氯硝基苯,狄氏剂,环氧七氯,α-硫丹,β-硫丹;5种拟除虫菊酯:甲氰菊酯,三氟氯氰菊酯,氯氰菊酯,氰戊菊酯,溴氰菊酯。

Cellulose, mannitol, hydroxypropyl methylcellulose phthalate, citric acid, sodium starch glycolate, glyceryl triacetate, modified cellulose gum, stearic acid, colloidal silicon dioxide, titanium dioxide and yellow ochre.

纤维素,甘露醇,羟丙基甲基纤维素邻苯二甲酸酯,柠檬酸,淀粉钠乙醇,三醋酸甘油酯,改性纤维素胶,硬脂酸,胶质二氧化矽,二氧化钛和黄赭色。

The influence of metallic stearates on the photographic properties of photothermographic material based on silver tolyltriazole was reported.

报道了硬脂酸盐(metal stearate简称:MSt2,M=Ni、Ba、Ca)对以甲基苯并三氮唑银(silver tolyltriazole简称AgTTA)为银源的光敏热显影材料感光性能的影响。

Mesoporous tin oxide was synthesized by using cetyltrimethyl ammonium bromide or CTAB and Tween-20 as the template or hydrothermal process. Hollow tin dioxide micospheres were synthesized by using resorcinol-formaldehyde gel as the template or hydrothermal process. Thermogravimetric analysis, X-ray diffraction and electron microscopy have been used to characterize the materials.

本文分别采用十六烷基三甲基溴化铵模板法、CTAB和吐温20复合模板法及水热法来合成介孔氧化锡;用间苯二酚和甲醛凝胶模板法及水热法合成空心球氧化锡,并用热分析、X射线衍射、电镜等对以上材料作了形貌及结构表征。

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Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在,所有的孩子都要在综合学校继续学习,所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地,使人们普遍认识到发展不能以牺牲农业为代价。

Detailed Intrinsic Reaction Coordination calculations were carried out to guarantee the optimized transition-state structures being connected to the related tautomers.

同时,做了详尽的内禀反应坐标计算,以保证所得到的过渡态连接相应的始末异构体。