A plunger (24) having an elongate body portion and a stopper (54) slidably positioned in fluid-tight engagement with the inside surface of the barrel is provided.
配置具有拉长主体部分和止动件（54）的柱塞（24），所述止动件以与针筒内表面液密啮合的方式滑动定位。
The magnetic fluid seals' rules at large gap and high speed conditions were studied and the theoretical explaining was given. A method to improve the tight capacity was given.
通过实验研究了大间隙、高转速条件下磁性流体密封的规律，并对其进行了理论分析。另外还给出了改进大间隙条件下，提高密封性能的措施。
The chimney shows the mineral zonation around a tight conduit associated with fluid, which is quite similar to those formed by modern black smoker at sea floor.
它们保留了成矿流体运移的通道构造，围绕通道构造还显示良好的矿物分带现象，完全可以与现代海底黑烟囱对比。
Experiments were carried out on tight gas formation core sample with a water base crosslinked gel fracturing fluid.
在室内用水基冻胶压裂液浸入致密气层岩心，进行了伤害试验研究。
Owing to a small fluid flowing rate, it is difficult to measure and interpret the physical parameters of low permeability tight rocks by use of conventional core analysis method.
对于低渗透致密岩石的物性参数，由于流体流动速率很小，采用常规的岩心分析方法难以测量和解释。
The measurement of fluid permeability of tight cores plays an important role in accurate evaluation of a reservoir.
致密岩心液体渗透率测量对储层准确评价起非常重要的作用。
For the tight sandstone containing gas, only velocity ratio of P wave to s wave and Poisson ratio are sensitive to fluid variation.
而对于致密含气砂岩，纵、横波速度比及泊松比对流体变化相对较为敏感。
The lubricator contains a tight-fitting rubber or bag preventer that prevents fluid loss and is held together with quick union.
防喷管包括一个紧配合的橡胶或筒式防喷器，以防止流体散失并可用快速装卸由壬连接在一起。
Sealing compounds and sealed fasteners are used on all joints to complete the fluid tight seal.
所有的接头处都用密封剂和密封紧固件进行密封。
Fracture is a main type of fluid flow path in tight reservoir rocks, and its development and distribution may control the formation of fractured hydrocarbon reservoirs.
裂缝是致密储层流体渗流的主要通道，裂缝的发育、分布规律控制着裂缝性油气藏的分布。
Fracture is a main type of fluid flow path in tight reservoir rocks, and its development and distribution may control the formation of fractured hydrocarbon reservoirs.
裂缝是致密储层流体渗流的主要通道，裂缝的发育、分布规律控制着裂缝性油气藏的分布。
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