可取代的

The spectra of X-ray diffract revealed that its crystal is B type and the value is about 18%, far lower than that of ordinary maize starch. With the method of chemistry modification, we modified the amylose starch with acetates. The result showed that the best reaction condition was at the ratio of 1:5.3 (glucose: acerbity), with MSA 1.5% catalyzer, at 75℃ for 3 h.

利用化学改性法对高直链玉米淀粉进行醋酸酯化改性，最佳反应条件为，淀粉葡萄糖基与酸的质量比1：5.3、催化剂甲磺酸用量为体系的1.5%、反应温度75℃、反应时间3 h，在此条件下可制备取代度为2.84的醋酸酯淀粉，比普通玉米淀粉高0.78。

Restaurants in Europe, the United States and Japan are testing technology to let diners order their food direct from a screen at their table instead of depending on a fellow human being to note their choice -- sometimes grumpily or erroneously.

欧洲、美国和日本的一些餐馆目前正在试用一种可让顾客直接通过餐桌上的屏幕点餐的技术，这项新技术取代了服务员点餐--服务态度不好或忙中出错的情况也可以避免了。

The monodic regression equation of BCF and t_R and the binary regression equation T...

统计检验表明，两类估算方程在不同固定相上的平均相关系数分别为0·952和0·965，均呈极显著相关(P·01)，可用于估算取代苯类化合物在草鱼体内的BCF，估算结果不受固定相极性的影响。

The microwave-assisted reactions could be finished within several minutes to give high conversion and selectivity.Substrates whose aryl groups were substituted phenyl or naphthyl groups were more suitable in this reaction.

以TfOH为催化剂，在优化的反应条件下，大部分反应都可在数分钟内完成，该反应对于芳基是取代苯环或萘环的的底物效果较好，能得到较高的原料转化率和产物选择性。

However, online shopping can't completely replace traditional shopping methods because of some inevitable deficiencies, e.g. the lack of touching real objects, the lack of optionality. Several seller's credit may not be so good and after-sale service is hard to operate sometimes. We are also difficult to imagine selecting such products like cars and heavy machinery in the network.

当然，网络购书的一些先天不足又决定了它不可能完全取代传统的购物方式，比如因无法触及实物而缺乏可选性、店家信誉良莠不齐而使售后服务有时难以操作等，我们也很难想象通过网络挑选诸如小轿车和重型机械之类的产品。

In the presence of palladium catalyst and triphenylphosphine, alkynyl Grignards or alkynyllithiums could successfully couple with alkyl bromides and iodides. Aryl-substituted propargylic dithioacetals could also be obtained by this strategy.

在钯触媒和三苯基磷的存在下，我们可利用炔基格林那试剂或炔基锂和简单的卤烷进行偶合，而这样的反应条件也能应用在苯基取代炔丙基硫缩酮衍生物的合成上。

If North Korea is genuinely prepared to completely and verifiably eliminate their nuclear weapons program, the Obama administration will be willing to normalize bilateral relations, replace the Peninsula's long-standing armistice agreements with a permanent peace treaty, and assist in meeting the energy and other economic needs of the North Korean people.

如果北韩真正打算完全并且可核查地去除它的核武器计划，奥巴马政府愿意和它建立正常的双边关系，以永久性的和平协议取代半岛长期以来的停战协议，并且帮助北韩人民满足其能源和其他经济需求。

If North Korea is genuinely prepared to completely and verifiably eliminate their nuclear weapons program, the Obama Administration will be willing to normalize bilateral relations, replace the peninsula's longstanding armistice agreements with a permanent peace treaty, and assist in meeting the energy and other economic needs of the North Korean people.

如果北韩有诚意地准备全面地、可核实地取消其核武器项目，奥巴马政府愿意实现双边关系正常化，以一项永久性的和平条约取代朝鲜半岛多年来的停火协议，并帮助满足北韩人民的能源及其他经济需求。

The regression equations could be used to estimate the BCF of the benzene derivatives in grass crap , and the results were not affected by the polarity of stationary phases.

统计检验表明，两类估算方程在不同固定相上的平均相关系数分别为0·952和0·965，均呈极显著相关(P·01)，可用于估算取代苯类化合物在草鱼体内的BCF，估算结果不受固定相极性的影响。

The electric elevator controlling has adopt two kinds way at present commonly, one being to adopt PC to control an element as the signal, accomplish electric elevator signal acquisition , operation state and functional setting up, that the automation controller and collection selections realizing an electric elevator run a function , drag moving is to come to be completed from the frequency transformer under the control of; The selections controlling way second kinds using programming controller to substitute PC realizing signal collection is controlled.

目前电梯的控制普遍采用了两种方式，一是采用微机作为信号控制单元，完成电梯信号的采集、运行状态和功能的设定，实现电梯的自动调度和集选运行功能，拖动控制则由变频器来完成；第二种控制方式用可编程控制器取代微机实现信号集选控制。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。