查询词典 expansion ring

When the radical center is located at the bridge methyl group, ring expansion is the favored rearrangement pathway unless a radical-stabilizing substituent is placed in the cyclobutyl ring adjacent to the bridge methyl group.

当自由基中心位于双环的桥甲基时，扩环过程占主导地位，但是与桥甲基相邻的环丁基上存在能够稳定自由基的取代基时，重排以开环为主。

The second is a special bond with the Road Agent will be in full closed (sealed expansion ring outside diameter less than diameter of the plunger body) state seal, with the sucker rod string and then go down the plunger, the plunger into the After the pump barrel and pump the same as rotating the impulse from the ordinary because of the improved Baptist slot only temporary pressure seal forms, go down soon after the sand to achieve sealing and resistance functions.

而其余各道密封在柱塞下入泵筒中2~7d内也全部打开。

In hardness and high hardness wear resistant ring expansion ring expansion.

中硬度耐磨胀圈和高硬度耐磨胀圈。

The effect of the expansion and the anti-thrust ring on the stress and deformation of the spiral case structure are analyzed respectively. It is found that the presence of expansion reduces in large extent the stiffness of the spiral case as a supporting structure of the turbine. It affects the safe stability of the hydro generator.

3通过对是否设置伸缩节与止推环的方案对比分析，发现设置伸缩节在一定程度上降低了流道系统的轴向刚度和抗扭转刚度，影响水电机组的安全稳定运行，设计中应予以重视。

Pointing to the table of the various periods of Xi'an maps, Liu Xinhua, said:"You see, this is a map of the last century 80's, Xi'an city has 'freed' wall bound, from a ring expansion to a second ring; the last century, 90s onwards, Xi'an, increased road and bridge, the Second Ring, Ring Ring Two, widening urban transport framework; the last 10 years, and gradually shaping of radiation from a new 'big Xian' metropolitan area, a new landmark in Xi'an in large numbers."

指着摆在桌上的各个时期的西安地图，刘新华介绍说：&你看，这是上世纪80年代的地图，西安城已'挣脱'城墙束缚，从一环扩张到了二环；上世纪90年代起，西安路桥增多，二环、三环两大环线，城市交通骨架日益拉大；最近10年，逐步辐射塑造起全新的'大西安'都市圈，使西安新地标大量涌现。&

This cementing agent in the erosion of the well gas and crude oil, the loss of part of the bond strength, all of the Road elastic sealing ring expansion was opened by the expansion force.

2用双卡脱接器和释放套连接抽油泵柱塞和泵筒。

Due to the ring strain and Lewis acid character, silacyclobutanes and silacyclobutenes can undergo ring expansion reactions to afford five- and six-membered silacycles, or ring opening to give organosilicon molecules and materials as well as fulfill organic transformations under very mild conditions.

硅杂环丁烷和硅杂环丁烯由于存在环张力和具有一定的Lewis酸性，能够通过扩环反应生成五元和六元含硅杂环化合物，也能够通过开环反应生成不同结构的有机硅分子和聚合物，抑或实现有机反应在温和条件下的转化。

These results show that the ring expansion of cyclopropylsilylene C3H5SiH to silacyclobutene is easy to occur with a barrier of 113.4kJ/mol, while the 1,2-H shift is not competitive to the ring expansion for its much higher barrier.

结果表明，环丙基硅烯经过113.4kJ/mol的势垒扩环重排为硅杂环丁烯为自发反应；而其1，2-氢迁移重排反应热垒为190.0kJ/mol，是非自发反应，难于进行，不能与扩环重排相竞争。

The rolling wheel of D51 rolling loop machine is fixed with an expansion ring and its axial locating accuracy is high so the processing difficult of rolling wheel is reduced.

D51型辗环机辗压轮系采用涨圈固定，轴向定位精度高，简化了辗压轮的机械加工；下支承轴端圆锥孔后面设有方孔，辗压辊与下支承轴的联接可靠，更换容易，减少了非生产性工作消耗，提高了劳动生产率。

Installation of two outer openings each staggered 180b, the inner and outer openings staggered opening 90b, and pin the three rings with a fixed, outer and inner expansion force in self-expansion force of working together, close to the surface of the pump cylinder run, inflation is not only the axial ring sealed, and the radial seal Ye Hao, it prevents micro-fine sand and into the axial friction pair, can also prevent the micro-fine sand and into the internal voids in the inner ring 3, the operation will not impede expansion ring breathing.

安装时2个外环开口互错开180b，内环开口与外环开口错开90b，并用销钉将3个环固定，外环在自身胀力和内环胀力共同作用下，紧贴泵筒内表面运行，胀圈不但轴向密封好，而且径向密封也好，故阻止微细砂进入轴向摩擦副，也可阻止微细砂进入内环3的内部空隙中，不会阻碍胀圈运行中呼吸。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。