ring unit

The results showed the voidage ratio of taper spiral packing,θ-ring packing and metal gauze corrugated packing was 0.823:0.947:0.855, and under the same liquid sprayed density, the pressure drop ratio of unit height of packing layer was 0.58:1.10: 0.62.

流体力学性能测试中，锥度螺旋填料、θ环和丝网波纹填料三种填料的空隙率之比为：0.823：0.947：0.855时，在相同喷淋密度下，单位高度填料层压降之比却为：0.58：1.10：0.62。

The 200 kt/ a lube phenol extraction unit in Lanzhou Petroleum Processing and Chemical Complex was revamped. The previous mixed packing mainly containing ladder ring was replaced by TH ⅱ type double saddle ring packing. A ripple shape packing support was adopted.

兰州炼油化工总厂200kt/a润滑油苯酚精制装置将原萃取塔以阶梯环填料为主的混装填料改造为THⅡ型双鞍环填料，填料采用波纹状填料支承；

~ 1H-NMR and UV analysis show that, after reaction, benzene ring in the structure unit of the alkali lignin is steady, carboxyl, carbonyl and methoxyl all have reduced in different extent, while aliphatic and phenol hydroxyl have increased.

~1H-NMR和UV光谱分析显示反应后碱木质素的结构单元中苯环结构稳定，羰基、羧基、甲氧基有所减少，醇羟基和酚羟基的量增加了。

Discussions on Replacement of Fuse Used in 10 kV Ring Mains Unit

10kV环网负荷开关中熔断器更换问题探讨

In the IBM Token-Ring Network, the transmit or output receptacle on an access unit.

在IBM令牌环网中，一个入口单元的发送或输出插座。

This paper presents a general design scheme of robot for checking in-use oil pipeline, and focuses on design of main component such as selection of electric motor and design of searching unit dish, slip-rings, high-pressure sealing ring and universal joints. Calculation results are provided.

现提出了检测机器人总体设计方案，叙述了主要零部件的设计，提供了计算结果.重点说明了电动机的选择、探头盘的设计、滑环的研制、高压密封件与万向节的设计与制造等。

Selection and mounting of power cable and termination used in 10 kV ring mains unit

10kV环网配电柜中电缆及电缆终端的选取和安装的若干问题

Let R be a local communicative ring that contains 2 as a unit or a communicative integral domain of characteristic other than 2.Let N be the nilpotent subalgebra generated by positive root vectors of chevalley algebra of type D_n ( n ≥ 4) over R.

设R是一个特征不是2的整环或是一个以2为单位的局部环，N是R上Dn（n≥4）型Chevalley代数的由正根基向量生成的幂零子代数。

The machine unit is made up of charging bucket, stepped gear, pulverizing knife, gear ring, pulverizing motor, discharging port, fan blade, aggregating box, dust collection box, etc.

该机由加料斗、分级轮、粉碎刀片、齿圈、粉碎电机、出料口、风叶、集料箱、吸尘箱等部分组成。

The atmospheric and vacuum unit for 200 Mt/ Y Koweit crude is simulated. The results show the model is correct by compa-ring with the demarcation data from actual industrial process.

对某石化企业加工200万吨/年科威特原油常减压装置进行了模拟计算，并与标定数据进行了比较，表明所建立的模型能反映实际的生产过程。