选择反应

In this part, a simple and inexpensive method for the synthesis of peroxynitrite based on the autoxidation of hydroxylamine in alkaline media was described.

文中对该检测体系的反应动力学特征、反应酸度、荧光检测酸度、羟基化底物的选择进行了研究，并提出了该方法的检测机理。

According to reaction characteristics of producing gasoline with high olefin by Daqing raw material and converting butylene to propylene, MMC-2 and the catalyst for maximizing yield of propylene developed by Lanzhou petro-chemic academe are used to perform trial study considering reaction conditions.

针对大庆催化原料、大庆原料经一段转化生成的高烯烃含量汽油和丁烯转化生成丙烯的反应特点，结合两段工艺技术所能提供的反应条件，选择MMC-2和兰州石化研究院开发的多产丙烯催化剂分别进行实验室的中试评价。

Longer reaction time (48 h) and increase of hydrogen fluoride and catalyst are good for fluorination.

反应后的滤渣可再生为氧化汞循环使用，回收3次，反应的转化率和选择率均大于85%。

Reaction conditions are studied, and the result shows that it is better to adopt mercuric oxide or mercuric fluoride as fluorination catalyst with reaction temperature -20~-10℃.

结果表明，采用氧化汞或氟化汞作氟化催化剂、氟化氢作溶剂较好，适宜的反应温度为－20~-10℃，较长的反应时间(48 h)和增加氟化氢和催化剂的量有利于氟化。2-氯－5-三氯甲基吡啶的转化率和选择率均可达到97%以上。

Thus, the gelation reaction kinetics equation lays a foundation for optimizing gelation condition and selecting reaction rate.

从而为利用固化反应的动力学方程选择最佳固化条件和反应速率打下了基础。

An experiment of water-rock interaction in the packed bed reactor between granodiorite and pure water under the condition of stable pressure of 22 MPa and continuous current has been performed to study the formation process of the Hucun skarn copper deposit in Tongling,Anhui.

以铜陵胡村矽卡岩型铜矿为研究对象，选择与成矿关系密切的花岗闪长岩，在22MPa恒压、不间断流动条件下，与纯水在叠层反应器中进行水-岩反应动力学实验研究。结果表明，水-岩反应速率与流体流速成反相关，与流体在体系内的停顿时间成正相关。

The effect of the molar ratio of guaiacol/methyl- nitrate ,the reaction temperature, the reaction time, the choices of nitrating agent and solvent in the synthesis of 5 -nitro-guaiacol has been studied.

本文研究了愈创木酚／硝酸甲酯的摩尔比、反应温度、反应时间，硝化剂和溶剂的选择对5——硝基愈创木酚合成的影响。

Methods: The tests of selecting conditions of determination trace selenium in food in potassium iodate system by oscillopolarography were carried out.

采用微分电位溶出仪完成了碘酸钾极谱体系测定食品中微量硒的条件选择，包括反应时间、反应温度和放置时间等。

The results indicated that control of water in the reaction system was very important to the formation of lactide.

结果表明，所选择的各模型反应为吸热反应且近似可逆，水的控制对丙交酯的形成很重要。

The result showed that crude protein content in food residue could be increased by compound culture of microzyme and mildew ,and crude protein content rose with reaction time increasing.

结果表明：酵母菌和霉菌联合作用于食物垃圾可以提高其粗蛋白含量，且粗蛋白含量随反应时间的延长而增加；康宁木霉3.2774与发酵水解液废液酵母2.570联合作用时效果最好，反应48h后，食物垃圾样品的粗蛋白含量增加了5.09%，相对增量达34.56%，因此可以选择这2种菌种作为食物垃圾固态发酵生产微生物蛋白饲料的优选复合菌种。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。