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The double ends of central tube is penetrated into pipe union nut and seal ring in turn, and the central tube is penetrated into ladder-shaped public connection, push the seal ring and chuck ring of double end into the ladder-shaped public connection separately, the thrash pipe union nut is heave, is credible tight connection.

将中心管两端依次穿入由壬螺母、密封圈，并将中心管穿入梯形公接头内，分别将两端的密封圈，压环推入梯形公接头内，锤击由壬螺母凸起，即可靠密封连接。

Firstly, according to study dynamic changes of the elements structures in succession about natural and artificial forest, then summarized regular patterns;at the same time.based on the study of Coupling Relationship between structure and function of water conservation forest established the ideal structures from the stand level and the watershed level. The ideal structures from the stand level: uneven-aged, double layer and mixed structure, and trend to natural forest. The watershed level followed the same principle, that is double layer patches, uneven-aged forest well-distributed and to build up different forest patches in watershed.

首先，经过对北京山区水源林天然林和人工林结构要素的演替动态研究，提出其发展规律，同时依据水源林结构与功能耦合关系研究，从林分层次和流域层次上分别构建了水源林的理想结构，其中，林分层次上水源林的理想结构为：异龄、复层、混交的结构状态，林分结构趋于天然林结构的特征；在流域层次上水源林的理想结构为也应形成&复层&、&异龄&、&混交&的结构，即：在流域各水源林斑块间形成林冠层复层、斑块内部乔木、灌木、草本层的复层；不同水源林年龄面积上的均匀分布；形成不同水源林斑块间的镶嵌分布。

In order to study the flow characteristics inside the double-channel impeller, a testing pump was designed and produced according to the special requirements for PIV measurement with two different impellers, i.e., the double-channel impeller and the two-blade impeller.

为研究双流道叶轮与普通叶片式叶轮的内部流动区别，设计制作了满足粒子图像测速仪测量要求的模型泵，模型泵的叶轮有双流道和双叶片2种形式。

According to the special requirements for centrifugal pump PIV measurement, a PIV testing platform was established to measure the instantaneous velocity in the double-channel pump with different impeller design, i.e., the double-channel impeller and the two-blade impeller, under different working conditions. The measured absolute velocity fields were transfered to relative velocity fields by specially developed code.

首次用PIV技术对设计工况与非设计工况下双流道叶轮及双叶片叶轮的内部流动分别进行了测量，并自编程序对测量得到的绝对速度场进行处理，得到相对速度分布。

Although the specific mechanism is poorly understood, it is known that the ribonuclease enzyme Dicer binds to and cleaves short double-stranded RNA molecules to produce double-stranded fragments of 21-23 base pairs with two-base single-stranded overhangs on each end.

虽然具体机制很难懂，它知道，核醣核酸酵素Dicer 束缚对和劈开短的double-stranded 核糖核酸分子导致21-23 基本的对的double-stranded 片段以二基地唯一搁浅的突出物在各个末端。

The main drive system uses the main axle motor (FANUC, the 25/20HP), and coordinated with the German ZF the double section type gearbox, it can do transmissions directly by tooth-shaped belt, which is steady and more efficiency (surpasses 95%). The double section type gearbox expanded the ranges of the

主传动采用FANUC 25/20HP主轴马达，并配合德国ZF双段式齿轮箱直接通过齿形皮带传动，传动平稳，而且效率高（超过95%）。

The system provides 0.01μm positioning resolution with double way and double frequency laser interferometer, and uses micro feed tool post to compensate the error of 0.1-0.01μm.

结合超精密车床的实际情况，研制了专用的内嵌式可编程序控制器，具有很大的使用价值。

Deep groove bearings, double row self-aligning ball bearings, cylindrical roller bearings, double row self-aligning roller bearings, needle roller bearings, angular contact bearings, Tapered Roller Bearings , plane thrust ball bearings, outer spherical surface bearings, linear bearings, joint bearings, self-lubricating bearings, ceramic bearings, stainless steel bearings.

深沟轴承、双列调心球轴承，圆柱滚子轴承、双列调心滚子轴承、滚针轴承、角接触轴承、圆锥滚子轴承，平面推力球轴承、外球面轴承、直线轴承、关节轴承、自润滑轴承、陶瓷轴承、不锈钢轴承。

Deep groove bearings, double row self-aligning ball bearings, cylindrical roller bearings, double row self-aligning roller bearings, needle roller bearings, angular contact bearings , Tapered Roller Bearings, Plane Thrust Ball Bearings, outer spherical surface bearings, linear bearings, joint bearings, self-lubricating bearings, ceramic bearings, stainless steel bearings and other products, complete specifications, a wide variety.

深沟轴承、双列调心球轴承，圆柱滚子轴承、双列调心滚子轴承、滚针轴承、角接触轴承、圆锥滚子轴承，平面推力球轴承、外球面轴承、直线轴承、关节轴承、自润滑轴承、陶瓷轴承、不锈钢轴承等产品，规格齐全，品种繁多。

No double team the non-ball player; defensive three-second rule eliminated; double team no more than 3 seconds in the 12' lane

第三个上升箭头：联盟缩短3分线，修改 hand-checking 规则，促使 ORtg /DRtg 再次上升，也就是说球队在100个回合内的得分效率更高了。

Vishnu entered a dark fourth dimensional dream that did not support his field or continued life.

毗瑟挐进入了一个第四密度的黑暗梦想，那里并不支持他的能量场或继续生命。

Leaders and decision-making persons use it to collect the data, including the information of unit work, handing in fee, oweing fee, prepaying fee,changing and afterpaying and account transfering of joining-insurance employee, and account paying of all kinds of insurances from hospitalization insurance institutions.The collected data is picked up, organized, switched and showed to user.

该子系统主要面向各级领导、决策分析人员；从各个医疗保险经办机构和定点医疗机构采集数据，包括在各个医疗保险经办机构处理的单位办公信息，单位缴费、欠费、预缴费信息，参保职工变更信息，参保职工增减变动信息，参保职工补缴信息，参保职工帐户划拨信息：包括各定点医疗机构处理的各险种帐户支出信息，各险种的统筹金支付信息等；将采集的数据提取，组织和转换，然后展示给用户。