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In 60 abroad -Finished mans base rubber bottle plug and substituted the course of the bottle plug of natural rubber in the seventies.

国外早在60—70年代就完成了丁基橡胶瓶塞替代天然橡胶瓶塞的过程。

To obtained useful chiral multi-substituted alkene-nitrile intermediates, the abnormal Beckmann rearrangement and their applications to the synthesis of the natural products were studied.

用甾体-17-酮肟的非正常Beckmann重排反应生成的相应的烯-腈化合物是合成18-去甲基甾体的重要中间体。

Based on water balance model, the change of figure coefficients of infiltration water and surface water storage under border irrigation was analyzed. The power index of movement distance and time has little influence on the figure coefficient of infiltration water in the course of surface water movement, which can be substituted by a stable value.

该文依据水量平衡模型，分析畦灌下渗水形状系数、地表储水形状系数的变化规律，结果表明下渗水形状系数受地表水推进过程中的推进距离和时间的幂指数影响很小，可用一个稳定值代替，由此建立了基于水量平衡原理的畦灌水流推进简化解析模型。

Meso-Tetrakis(2,6-dichlorophenyl)porphyrinmanganese chloride and carbonyl ruthenium meso-tetrakis(2,6-dichlorophenyl)porphyrin were prepared and used to catalyze the diastereoselective epoxidation and amidation of 3β-substituted Δ 5-steroid derivatives.

研究了 5 ，10 ，15 ，2 0 (2 ，6 二氯苯基)卟啉锰及其钌配合物这类非手性的催化剂催化3β取代的Δ5 甾体衍生物的非对映选择性环氧化及酰胺化反应。

The transition state theory approach to cis-trans isomerization in substituted disilenes is presented.

本文介绍了过渡态理论对双键取代物顺反异构化过程的处理方法。

Simple RAM architecture is substituted by the combination of CAM and RAM for forming PID information table, by which the resource is saved and high speed performance is obtained. A "two step" algorithm of Program Clock Reference correction was proposed, which reduces the complexity of hardware design obviously and limites the PCR jitter in a small range. Based on the remuliplexer, thr...

该方案采用 CAM+ RAM组合代替简单的 RAM结构用于构造 PID信息表，在保证速度的基础上，大大节约了资源；提出了&两步法&PCR校正算法，在保证节目时钟基准校正精度的基础上，大大减小了硬件设计的复杂度；基于该再复用器，提出了 MPEG- 2传输流、纯数据、主控机插入等几种实用的数据插入方式，以适应不同的应用环境

The cobalt blue bulb glass manufactuerd by soda-lime silicate is substituted for different proportion of potassium, sodium and lithium.

透过这些钴蓝玻璃的灯泡发光钨丝呈现不同的颜色，含大离子半径碱的呈红黄混合色，含小离子半径碱的呈纯正红色。

The supplement of selium or iodine as twice as control ilmproved the deposition of selium or iodine, which was credible basis on de- veloping functional food. 3. The composition of basal diet affected yolk color, when one third wheat, or one third rice, or one second wheat, or one second rice were substituted for yellow corn, the yolk color decreased to 5, 4, 3, 2 degree respectively.

本试验中1/3小麦替代玉米组蛋黄颜色降到5级，1/3大米替代玉米组蛋黄颜色降到4级，1/2小麦替代玉米组蛋黄颜色降到3级，1/2大米替代玉米组蛋黄颜色降到2级。

In practice, a period charge for depreciation is usually substituted for a more exact measurement of benefits yielded.

在实践中，往往以定期提取的折旧费来代替更为精确地衡量出来的产出收益。

Where recommended, two pilot, or guide, pins should be used. These pins are substituted for transmission Bolts and prevent damage to the clutch friction disk as the transmission is moved Back.

此处建议使用两个导杆销钉，用来代替变速器螺栓，以免把变速器装回去时，损坏离合器摩擦盘。

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。