往复运动

It is mainly made up of frame, gate board, screw pole, nut etc. Rotate the handwheel by hand, then the screw pole drives the nut a nd gate board move in horizontal to a nd fro to open or close the valve.

主要由框架、闸板、丝杆、螺母等零件构成，用手转动手轮使丝杆带着丝杆螺母和闸板沿水平方向往复运动，达到闸门的启闭目的。

It is mainly made up of frame, gate board, screw pole, nut etc. Rotate the handwheel by hand, then the screw pole drives the nutgate board move in horizontal tofro to openclose the valve.

主要由框架、闸板、丝杆、螺母等零件构成，用手转动手轮使丝杆带着丝杆螺母和闸板沿水平方向往复运动，达到闸门的启闭目的。

The paper is mainly focused on the friction process between piston ring andcylinder when piston moving back and forth with cylinder.

本文主要研究内燃机活塞环-缸套摩擦副作往复运动时的摩擦过程特性。

The variation of friction force between piston ring and cylinder liner,which may exert great influence on the engine operation, is very complicated because of the reciprocation of piston assembly.

摘 要：由于往复运动特性，工作状态中活塞环缸套的动态摩擦力非常复杂，而且对发动机的工作状况有重要影响。

Continuously reciprocating piston movement, the water pump and water pressure on the continuous process of alternating.

活塞不断往复运动，泵的吸水与压水过程就连续不断地交替进行。

Piston pump mainly by the piston in the pump cylinder for reciprocating motion to breathe and remove the liquid.

活塞泵主要由活塞在泵缸内作往复运动来吸入和排除液体。

The oil extraction rod is connects the pumping unit and the oil pump transmission device, Through reciprocal motion extraction petroleum.

抽油杆是连接抽油机和抽油泵的传动装置，通过往复运动抽取石油。

The greatest difficulty of a piston strain measurement system is how to get the temperature signal from the reciprocating piston.

对高速往复运动活塞的应变场进行测量的最大困难在于如何可靠地将应变信号引出。

The opening of the valve body in a leading role in the orientation of any reciprocating parts, in the active pieces into fixed at the minimum radial clearance of not less than 0.7mm, valves should be in a spy state, the activities of parts and fixed parts Minimum radial clearance of A42C Type Pound-Grade Low Lift Spring Loaded Safety Valve not less than 0.125mm.

阀体中对阀的开启起主导作用的任何往复运动的导向零件，在活动件进人固定处的最小径向间隙不应小于0.7mm，阀处于伺应状态时，活动件与固定件的最小径向间隙不应小于0.125mm。

The opening of the valve body in a leading role in the orientation of any reciprocating parts in the active pieces into fixed at the minimum radial clearance of not less than 0.7mm valves should be in a spy state the activities of parts and fixed parts Minimum radial clearance ofA42C Type Pound-Grade Low Lift Spring Loaded Safety Valve not less than 0.125mm.

阀体中对阀的开启起主导作用的任何往复运动的导向零件，在活动件进人固定处的最小径向间隙不应小于0.7mm阀处于伺应状态时，活动件与固定件的最小径向间隙不应小于0.125mm。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。