杆

Firstly, based on the wave equation, determining reasonably its initial boundary condition, the paper establishes a computer diagnostic model of oil pumping mechanical well, the damping factor in the model has been reasonably determined, the implicit difference solutionis conducted to the model by changing of step width expression difference solves, and the half analytical solution is explored to the model - fine integral method; and realizes the transformation from dot indicator diagram to indicator diagram of any section.

首先从抽油机井计算机诊断技术的理论基础入手，考虑多级抽油杆连续性，建立了粘滞阻尼波动方程，合理确定模型中的阻尼系数，采用无条件稳定的隐式差分法及半解析方法求解方程，获得抽油杆柱任意断面和抽油泵处的示功图。

It is pointed out that the members distortional buckling conditions lie on the section firstly and then the length of members.

指出压杆畸变屈曲是否发生首先决定于截面尺寸和形式，其次决定于压杆长度。

This approach can be applied to determine the parameter distribution of structural damping characteristics.

理论分析证实基于弹性波动力学理论下粘滞阻尼理论及复阻尼理论在杆的轴向振动及梁的横向振动中的一致性，可应用这种方法来确定杆式结构及梁式结构的阻尼特性参数分布。

He drops a ball immediately behind that divot hole. the ball rolls nearer the hole than the spot from which the previous stroke was played, but not more than two club-lengths from where is was first struck the ground.

这名球员立刻在那块草皮后面抛了一个球，球滚到了比前一杆打球地点更接近球洞的地方，但距离第一次击打到地面时的距离不超过两个球杆远。

The protective relay is very important factor to avoid unselected trip under complex faults between double circuit lines, and to enhance the reliability of power supply. In order to improve the performance of the relay devices during evolved faults, an evolve fault criterion used for power system EHV transmission lines is proposed in this paper.

同杆并架输电线路发生各种故障时继电保护动作的正确性及可靠性将极大地影响电力系统的供电可靠性和运行稳定性，因此对配置于同杆并架输电线路继电保护的研究有着十分重要的意义。

Anti-static design Blow-out proof stem Pressure balance device on the ball Double stem packing and two-pieces shrapnel device Clearance device on the body

阀杆防爆出装置。◇钢球上设计有压力平衡孔。◇双层阀杆填料与两片蝶性弹片装置。◇阀体上设计清洁阀腔装置。

Our company specializing in the production of dual-cone, double-barrel, screw, double-, double-cone plastic extrusion machines, single screw extruder, plastic pipe production lines, plastic profile production lines, plastic sheeting, sheet production line, plastic extrusion To create materials and production lines dedicated to the production of environmental protection Plastic-wood extruder.

我公司专业生产锥双、平双机筒、螺杆，平双、锥双塑料挤出机、单螺杆挤出机、塑料管材生产线、塑料异型材生产线、塑料板、片材生产线、塑料挤出造料生产线及专用于生产环保塑木的挤出机。

The instantaneous gearbox torque at a given polished rod position (whether on the polished rod upstroke or downstroke) is the torque factor at that polished rod position multiplied by the net gearbox load at that position.

在一个指定光杆位置的瞬时变速箱扭矩（无论是上行还是下行冲程）等于那个光杆位置的扭矩因数乘以那个位置的变速箱净载荷。

Rigid PVC pipe production line is mainly used in the manufacture of the plastic PVC pipes with various tube diameters and wall thickness in the aspects such as the agricultural and nonstructural plumbing, cable laying etc. Thin set is composed of the conical twin-screw extruder, vacuum forming table , dragger, cutter, stirring up rack etc. The screws extruder and the extractor adopt the imported AC frequency employ the superior goods. The prime mover has the traction modes such as to claw, three-claw and so on. It may choose the saw blade cutting type or the planet cutting type. It is additionally attached with measuring apparatus and the intensifying device. The unit is of the reliable performance and high production efficiency. This company may allocate the special installation for the manufacture of the inner wall spiral coil and core ply blister tube set according to the clients requirements.

硬质PVC 塑胶管材出产线主要有阿谁与出产农用给排水、建筑给排水、线缆铺设等方面的各类管径、壁厚的塑胶PVC管材，该机组由锥形双螺杆挤出机、真空定形台、牵引机、翻料架等构成螺杆挤出机及牵引机采用进***流变频调速设置，真空泵以及牵引机电均采用优质产品牵引有二爪、三爪、四爪、六爪等牵引体式格局可选用锯片或者行星切割形式，另可计长及增厚装置，机组机能可靠，出产效益高，本公司可更具客户的要求，配备布置专用装置出产螺旋消音管以及芯层发泡管机组

After finished the drawbar spring disc alignment then fix the spring disc stopper, and turn in let the spring disc total length to the standard length (114pcs about 277mm), then the drawbar top fix the M16x1.5 nut.

连接杆弹簧圆盘调整成一直线，然后固定弹簧圆盘的止动块，使之总长为标准长度（114个约277mm），再在连接杆顶部固定M16x1.5的螺母。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。