有环的

The activation energy of epoxy asphalt was lower than that of without asphalt systems.

有沥青的环氧固化体系的反应活化能要小于无沥青的环氧固化体系。

In the first part, we studied the possibility of allyl as the protection group of the hydroxyl in nucleosides.

烯丙基作为糖化学中的一种常用保护基在核酸化学中有一定的应用，曾有人将它作为磷酸酯键及碱基环上羰基的保护基，但作为核苷糖环羟基的保护基还未有研究。

The main component of the celestial globe is a hollow bronze globe, with crisscross grids on the spherical surface, which are used to delineate the exact position of celestial bodies.

整个铜球可以绕一根金属轴转动，转动一周代表一个昼夜，球面与金属轴相交于两点：北天极和南天极。两个极点的指尖，固定在一个南北正立着的大圆环上，大圆环垂直地嵌入水平大圈的两个缺口内，下面四根雕有龙头的立柱支撑着水平大圈，托着整个天体仪。

PDCA can be an independent circle to solve an independent problem.

PDCA可能是一个独立的环，如解决一个独立的问题，当这个问题解决了，那么这个环也随着消失了；也可能是一个持续改进的过程，即螺旋上升过程，即当这个问题没有解决或已经解决了但又有新的问题发现，又会根据这个问题，进行下一个PDC循环。

Let R be a ring with identity. Then R is a division ring if and only if every unitary module over R is a free module.

R 是有单位元的环，它是除环的充分必要条件是其上的所有幺模都是自由模。

Both cilia and flagella have the same internal structure: nine doublets are arranged in a ring and extend the length of the cilum or flagellum, and two more imcrotubules run down the center of the ring.

鞭毛和纤毛都有相同的内部结构：九对排列在一个环上，鞭毛和纤毛伸展着长度，两个以上的微管沿着环的中心向下运动。

The differences of major frequency-domain characteristics and the interior relationships between electrode and electrodeless lamps are compared.

有电极荧光灯电子镇流器的分析和设计是基于镇流器谐振环的频域基波近似分析，从中得到谐振环的谐振频率公式、阻抗角公式、输出电压和电流公式。

This can be explained in terms of phenyl ring aggregate formation through π-π interaction.

这些多环聚集体之间虽然有稳定性的差异，但它们都是一些能量上较为稳定的多个苯环的缔合体。

From the calculations, it can be found that the van der Waals interactions, the hydrophobic interactions, as well as the H-bonding interactions are crucial for the ligand binding. The 4-phenylamino group can produce strong van der Waals adn hydrophobic interactions with the nonpolar side chains of the residues deep in the binding cleft. The R^1 and R^2 substituents on the bicyclic chromophore can also produce strong van der Waals and hydrophobic interactions with the residues located at the exterior part of the binding pocket. Moreover, the two N atoms of the quinazoline can form H-bonds with EGFR, which will produce significant contribution to biological activities. The calculated nonbonded interactions between anilinoquinazolines and EGFR, as well as the information obtained from the predicted complexes, can interpret the structure-activities of the inhibitors well, which can afford us important information for structure-based drug design.

从模拟结果得到的抑制剂和靶酶之间的相互作用模式表明范德华相互作用、疏水相互作用以及氢键相互作用对抑制剂的活性都有重要的影响，抑制剂的苯胺部分位于活性口袋的底部，能够与受体残基的非极性侧链产生很强的范德华和疏水相互作用，抑制剂双环上的取代基团也能和活性口袋外部的部分残基形成一定的范德华和疏水性相互作用，而抑制剂喹唑啉环上的氮原子能和周围的残基形成较强的氢键相互作用，对抑制剂的活性有较大的影响，计算得到抑制剂和靶酶之间的非键相互作用能以及抑制剂和靶酶之间的相互作用信息能够很好地解释抑制剂活性和结构的关系，为全新抑制剂的设计提供了重要的结构信息。

3 Open the regulator and the nozzle ring ring screw fixation screws; 1.3.4 release and remove the valve cover nut; 1.3.5 screw bolts with rings at the stem, from the valve assembly of the upper part of the body perpendicular to bring devices; when the upper part of unit from the valve body will be raised when the stem or any part not allowed to have any sway movements, any shaking could damage to the valve seat.

1.3.3 拆开调节环固定螺丝和喷咀环固定螺丝； 1.3.4 松开并拆下阀盖螺母； 1.3.5 用吊环螺栓拧在阀杆上，从阀体内垂直提起组装的上部装置；当从阀体内将上部装置提出来时，不允许阀杆或任何部件有任何的摇摆动作，任何摇动都可能损坏阀座。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐