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Under the conditions of acidity and dehydration, the abnormal Beckmann rearrangement usually occurs in α-electrofugally substituted cyclic ketoximes and gives a ring opened alkene-nitrile compound.

一。非正常Beckmann重排反应在甾体-17-酮肟中的应用对甾体18-甲基修饰是制备生物学重要的18-去甲基甾体的有效方法之一。

In Chapter 5,the pyrolysis of substituted six-membered ring model compound 4-methyl pyridine has been investigated.Instead of detail theoretical analysis of the reaction mechanism,the general results have been proposed from the products distribution and the combination of the pyrolysis investigation of its analogous pyridine.The major products are H_2,C_2H_2,C_4H_2,C_3H_3N and HCN,here HCN is not a primary initial product at low extent of decomposition.The mole fraction profiles of products have been obtained from the near threshold ionization.The pyrolysis of 4-methyl pyridine is initiated from the methyl abstraction and hydrogen abstraction procedures which are associated with the understanding of the soot formation and the NOX precursor correspondingly.

主要产物为H_2，C_2H_2，C_4H_2，C_3H_3N和HCN，其中HCN为非低温时的热解产物；通过近阈值电离并导出物种随温度变化的摩尔分数曲线，更详细地定量地描述了产物随温度的变化。4-甲基吡啶热解主要从母体脱甲基和脱氢两个初始反应出发，一种趋势是形成大质量数的苯并或杂环的多环化合物，有助于了解炭黑形成过程中的复杂化学过程；另一趋势是开环生成小的碳氢和腈类物质，实验得出的含氮物质的种类及随温度变化有助于了解NO_x的前驱物质的形成及其变化规律。

This dissertation is dedicated to investigate the pyrolysis of the fuel-bonded nitrogen model compounds,including five-membered ring nitrogen model compound pyrrole and the substituted six-membered ring nitrogen compound 4-methyl pyridine,with vacuum ultraviolet single-photon ionization combined with molecular beam mass spectrometry technique.

本论文利用同步辐射真空紫外单光子电离、分子束取样和反射式飞行时间质谱相结合的技术研究了含氮杂环模型化合物的热解，包括五元环含氮体系、六元环含氮体系和替代的六元环含氮体系(4-甲基吡啶)。

In this chapter, the Preachers also gave up certain elements of the canonical life; they relinquished all possessions and revenues, and adopted the practice of strict poverty; they rejected the title of abbey for the convents, and substituted the rochet of canons for the monastic scapular.

在这一章中，传教士们也放弃了某些内容的典型生活方式，他们放弃了所有的财产和收入，并通过实践的严格贫穷，他们拒绝的标题修道院为修道院，并取代了rochet的门炮，为寺院肩胛骨。

This sample shows what I mean by substitutability: A circle has been substituted for an ellipse.

该例子展示了我说的替换的意思：一个圆替换了一个椭圆。

The features of new electro-optic products are analyzed,and a scheme of the total inspection substituted for the sampling inspection is proposed.

分析新型光电产品的特点，提出以全数检验替代以前光学产品采用抽样检验的方案。

The synthesis of fluorine substituted saponite was explored and suceeded under mild temperature hydrothermally. Microwave-hydrothermal synthesis of sapontie was performed first time.

对于层状材料的微波水热快速合成研究也进行了首次探索，发现可以在可接受的合成条件下得到具有三八面体结构的皂石。

First,schoolchild shape creation ability development course has five main implications:(1) having the continuous change development characteristic,(2) appearing comparative primary and the simple connotation,(3) belonging to the spontaneous shape creativity manifestation to be widespread,(4) taking the creative imagination as the main manifestation,(5) owning the function and the status which cannot be substituted.

一学童造形创造能力发展历程具有五项主要涵义：(1)具有不断变化发展的特质，(2)显现较为初级和简单的内涵，(3)属於自发性的造形创造力表现形式广泛，(4)以创造性想像为主要的表现形式，(5)具有不可替代的作用和地位。

The anastomosis site had smooth serosa and scar membrane in gross and were substituted by regenerative fibrous tissue.

可降解吻合环应用于肠切除、肠吻合在动物实验中是安全有效的，且优于线缝合组。

In the control system,a simple control which substituted for the multiple-loop servomechanism was applied.

在生产过程中，如何调整每个拉拔电机的转速，保持各个环节的张力平衡，是个关键问题。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！