查询词典 substitution method

Carboxymethyl starch was prepared from cornstarch by using a dry method,and the molecular structure,granule configuration and crystallizability of the carboxymethyl starch es with different substitution degree were investigated by using ultrared spectrograph,electro scanning microscope and x-ray crystallograph.

以玉米淀粉为原料，干法制备羧甲基淀粉，并利用红外光谱仪、扫描电子显微镜和X-射线衍射仪对不同取代度的羧甲基淀粉的分子结构、颗粒形貌及结晶性进行了研究。

The third chapter focuses on the theory and method of measuring the intertemporal elasticity of substitution and the risk-averse coefficient.

第3章跨期替代弹性与风险回避系数的测量理论与方法。

Based on analysis of the grinding shortcomings associated with brown emery wheel of the roller s skew tooth top-surface,a method was proposed,which used CBN grinding wheel in substitution for traditional brown emery wheel.

在分析罗拉斜齿顶面棕刚玉砂轮磨削缺陷的基础上，提出用立方氮化硼砂轮代替传统的棕刚玉砂轮进行磨削加工；确定CBN砂轮的构造特性和结构尺寸；设计CBN砂轮金刚滚轮修整装置；并对CBN砂轮修整参数进行深入分析研究。

To simplify the detrusion of the double integral exchange formula,a simple method is derived after using the recevant knowledge of the methed of substitution in definite integral and double integral.

为简化二重积分换元公式的推导，利用定积分的换元法及二重积分的有关知识，提出了一种简便的推导方法。

Internet and the WWW user's fast growth, its application service multiplication, the far-seeing person mostly may realize traditional in addition the market function, has already had the revolutionary change, the hypothesized on-line marketing channel will have the charm and the benefit Internet non- national boundary has the general expenses populace, said to all the various trades and occupations, will be a brand-new challenge and the opportunity, even some people forecast, if will not have to make contact with the Internet train in recent years, will be is sentenced in the future only destiny leaves office on-line shopping it to sell the spot is serves the quality, the institute emphatically is the oral traditions, Therefore the Internet application is not the complete substitution, but is strengthens the service the auxiliary means, must become the market winner's method to be very many, but must let the consumer know your existence, and can provide more services is first step .

Internet与WWW用户的快速成长，加上其应用服务的多元化，有远见的人大多可以意识到传统的市场机能，已经产生了革命性的变化，虚拟的网上销售渠道将更具魅力与效益。Internet的无国界而拥有广大的消费群众，对各行各业来说，均是一项崭新的挑战与机会，甚至有人预测，如果没有在近几年搭上Internet列车，在未来唯一的命运就是被判出局。网上购物其卖点是服务品质，所着重的是口碑，因此Internet的应用不是完全的取代，而是加强服务的辅助工具，要成为市场赢家的方法很多，但是要让消费者知道您的存在，并且能够提供更多的服务则是第一步。

AbstractInternet and the WWW users fast growth, its application service multiplication, the far-seeing person mostly may realize traditional in addition the market function, has already had the revolutionary change, the hypothesized on-line marketing channel will have the charm and the benefit Internet non- national boundary has the general expenses populace, said to all the various trades and occupations, will be a brand-new challenge and the opportunity, even some people forecast, if will not have to make contact with the Internet train in recent years, will be is sentenced in the future only destiny leaves office on-line shopping it to sell the spot is serves the quality, the institute emphatically is the oral traditions, Therefore the Internet application is not the complete substitution, but is strengthens the service the auxiliary means, must become the market winners method to be very many, but must let the consumer know your existence, and can provide more services is first step .

摘要Internet与WWW用户的快速成长，加上其应用服务的多元化，有远见的人大多可以意识到传统的市场机能，已经产生了革命性的变化，虚拟的网上销售渠道将更具魅力与效益。Internet的无国界而具有广大的消费大众，对各行各业来说，均是一项崭新的挑战与机会，甚至有人预测，如果没有在近几年搭上Internet列车，在未来独一的命运就是被判出局。网上购物其卖点是服务品质，所着重的是口碑，因此Internet的应用不是完全的取代，而是加强服务的辅助工具，要成为市场赢家的方法很多，但是要让消费者知道您的存在，并且能够提供更多的服务则是第一步。

Carries on the synthesis experiment, the productdepuration, through the highly effective liquid phase chromatographydetermination content once more, by the highly effective liquid phase,infrared, the ultraviolet spectrophotometric method and so on carrieson the attribute Key word: Ginger flavine; Substitution reaction; Crystal;Synthesis.

再次进行合成实验、产物提纯、通过高效液相色谱法测定含量，以高效液相、红外、紫外分光光度法等进行表征关键词：姜黄素；取代反应；晶体；合成。

According to the synthetic methods study of the quinolones, it is found that the synthetic method of parent ring is of wide use by the condensation from α-substituted aryl formyl-β-substituted aminoacrylic acid and the inner molecular nucleophilic substitution reaction, which is almost suitable for the quinolones preparation of different rings or different substituted groups in 〓-position.

然后，对其合成方法进行了归纳，发现：由α-取代芳甲酰基-β-取代氨基丙烯酸缩合，经分子内亲核取代反应形成喹诺酮母环的合成方法用途非常广，几乎适用于所有不同环系或〓-位是不同取代基的喹诺酮类衍生物的制备。

The integration by second substitution is an important method of calculating indefinite integral,it has a certain application,it usually applies to calculate some integrals of irrational function.

第二换元积分法是求函数不定积分的一种重要方法，具有一定的适用范围，对某些无理函数的积分的求解通常使用该方法。

this paper apply design patterns and principals "open closed principle","dependence inversion principle", and "liskov substitution principle" to construct a system framework which support all sorts of databases, and supply a method for exchanging different database systems by configuring parameters.

本文应用"开－闭原则"、"依赖倒转"、"里氏代换"等设计模式和原则，构造了便于扩充数据库类型的系统架构，给出了通过配置参数转换数据库类型的方法。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。