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hydraulic head assembly 高压泵头总成
Simple acidizing well head assembly. 简易酸化井口装置的研制与应用。
Which well head assembly is better is easy to decide. 哪个井口装置更好些是容易决定的。
The results indicate that orifice efficient water head is total water head and is not hydraulic head for uniform discharge along porous pipe. 结果表明，对沿途均匀泄流管道来说，其作用水头不能仅以压头为计算依据，而应以总水头为准。
In multi-channel digital magnetic record/playback heads, the angle between the parallel lines measuring gap scatter and the nominal direction of tape motion over the head assembly. 在多道数字记录／读出磁头中，测量间隙变化的平行线与磁带在磁头组合件上运动的标定方向之间的夹角。
The definition of the performance measurement function is the average hydraulic head and root mean square error hydraulic head in the homogenous problem. 在均质问题中，定义执行度量函数为模拟水位平均值、模拟水位与观测水位平均值之均方根差值。
The receptance method was applied to connect the spinning disk and the head assembly. 读写头组合乃由一悬臂之自由端连结读写头(质量块)与空气弹簧而成。
While groundwater flows through an unconfined aquifer due to heterogeneity, the vertical average saturated hydraulic conductivity is a function of hydraulic head. 地下水流于非拘限含水层流动时,因含水层之非均质性,使得垂直平均之饱和水力传导系数随地下水水位高低而变化。
Hydraulic head pressure forecasting of water gushing for deep-lying Karst tunnel is of importance in engineering practice and the former evaluating methods is too rough. 摘要深埋隧道涌水最大水头压力的预测具有重要的实际意义。
In order to control the movement of the placement delivery head assembly,it is usual to adopt computer numerical control(CNC). 纤维铺放成型技术的控制系统主要是采用计算机数控 (CNC)来实现。
Based on Faraday effect, a bulk-glass passive OCT is developed by using phase compensation and sensing head assembly technique. 基于法拉第效应，利用相位补偿和传感头组装技术，研制了块状玻璃式无源光电电流互感器。
The basic guts are mechanical: a stepper motor turns a belt that moves the print head assembly back and forth across the target page.The assembly holds the ink cartridges. 机器内部的基本零件都是机械式的：有个步进马达控制传动带的运转，让喷墨印表头组件在页面上来回移动，这个组件里也包含墨水匣；
About energy economization, mainly introduced how new technologies and methods are used in utilizing of hydraulic head, decreasing pressure and quantity, setting of fire-fighting system, water pump, supplying of hot water etc. 关于节能，主要介绍了在给水管网水头的利用方面，减压节流问题方面，生活与消防系统设置方面，水泵方面，开水供应方面的节能新方法、新技术。
Groundwater runoff is the subsurface flow which flows from highhydraulic head to low hydraulic head in rock medium.It streams throughcommunicating interstices of fractured zones mostly. 地下径流是岩石介质中由水头高处向水头低处流动的地下水流，它主要通过断裂带等连通的空隙流动。
In multi-channel digital magnetic record/playback heads,the angle between the parallel lines measuring gap scatter and the nominal direction of tape motion over the head assembly. 在多道数字记录/读出磁头中，测量间隙变化的平行线与磁带在磁头组合件上运动的标定方向之间的夹角。
The head teacher told the school at assembly. 校长在全校学生大会上讲话。
deterministic hydraulic head boundary 已知水头边界
Hydraulic heads at the geothermal wells reflect a flow trend from south to north of thermal groundwater in the Wumishan Group due to the obstructing of the Huangzhuang-Gaoliying fault. 地热井水头分布趋势反映雾迷山组白云岩热储地下热水受黄庄-高丽营断裂阻隔后由南向北方向径流。
She nestled her head on his shoulder. 她将头依偎在他的肩上。
Multichannel recorders employ four head assemblies which are precisely positioned on a single baseplate to ensure alignment with the tape. 多通道记录仪中有四个磁头组件，精确地安置在同一块底板上，以保证与磁带对准。