化

It is prepared from pentachluorobenzonitrile by using KF as fluoride to substitute chlorine in the presence of benzonitrile under high temperature. But owing to the low solubility of KF and rigor synthesis condition, and the parallel auxiliary reactions, the speed of reaction as well as the yield is very low.

五氟苯甲腈的合成开发以五氯苯甲腈为原料在较高的温度下用氟化钾做氟化剂，通过取代苯环上氯原子而得到的，由于氟化钾在溶剂中溶解度低，合成条件要求苛刻，反应速度较慢，同时存在有平行竞争副反应，因而反应收率较低，国内尚无厂家生产。

The 3-chloro-4-trifluoromethoxy benzonitrile was synthesized from 3-chloro-4-trifluorome- thoxy aniline by diazotization, formaldoximation ,hydrolysis and cyanation.

以3-氯-4-三氟甲氧基苯胺为原料，经重氮化、甲醛肟化、水解和腈化反应得到纯度≥99。

The properties of four factorized chi-square forms, which are used in minimization of correlated data, are studied, including their biasness and unbiasedness.

研究了关联实验数据的四种因子化形式的χ2 表达式及其极小化性质，同时讨论了极小化估计值的有偏性与无偏性。

A new measuring method and a technical scheme are proposed , which estimate the smoulder final point by analysing Binary images of the flame images obtained from the third wild mouth of smoulder furnace .

提出了一种通过对烟化炉三次风口火焰图象二值化分析处理，判断烟化炉吹炼点的方法和技术思路。

The fourth chapter is an analysis on the non-functional harmonic progress on eight aspects to dissertate. From lonely leading of melody composing to modal harmonic progress, the combine of bitonality and polytonality harmonic progress, the polyphonic harmonic progress and so on.

第四部分对斯特拉文斯基作品中非功能化的和声进行做了具体的分析与比较研究，从单线条的旋律构成到调式化的和声进行、双调性多调性的结合、复调化和声进行等八个方面予以分类论述。

The main problems in boron carbide ceramic machining are introduced,and the laser technique is used to machine boron carbide.

介绍了碳化硼陶瓷加工中存在的主要问题，将激光技术应用于加工碳化硼陶瓷上，研究出一种新型加工方法，设计出两种有效的激光切割方法并对碳化硼陶瓷进行切割。

On the other hand, in order to contact to practical application and combine the actual experimental condition, we can make some elementary research on the application of boron nitride which has been synthesized.

将合成的纳米氮化硼材料进行表面改性，改善纳米粉体表面的润湿性，增强了其在介质中的界面相容性，使氮化硼纳米粒子容易在有机化合物中分散，提高了氮化硼纳米粉体的应用性能。

The brewhouse can mash both by batch processing and continuously.

糖化车间既能分批糖化，又能连续糖化。

The effects of microwave and oil expanding methods on expansibility and brittleness of rice cake were discussed.

探讨了微波膨化与油炸膨化对米饼的膨化度和脆度的影响。

When the is 0.1mol/l, ratio / is 0 or 4, aged at 95250℃ for 24 hours, anatase and rutile TiO〓 particles are formed respectively; when the ratio / is between 0 and 4, mixture of anatase and rutile TiO〓 particles is formed, the high the temperature the more the rutile phase. When the / is 5, aged at below 200℃ for 24 hours, amorphous product is gained, aged at 250℃ for 24 hours, olive-like TiO〓 particles with brookite structure are formed.

Ti〓=0.1mol·L〓时，95～250℃陈化，/比为0时，得到金红石型TiO〓颗粒，/比为4时，得到锐钛型TiO〓颗粒；/比介于0～4，可得到金红石型与锐钛型混合二氧化钛颗粒，温度越高含金红石型成分越多；/比为5，200℃以下陈化，得无定型产物，250℃陈化得橄榄形单分散板钛矿型二氧化钛。

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。