The sand column, saturated at its lower portion and initially in the condition of hydrostatic equilibrium, is drained at its bottom at constant head.
砂柱下部饱和并处于静水平衡状态，在底部为定水头的条件下进行排水。
I didn't know what I was feeling; it was just a constant replaying of the event in my head.
我并不知道我当时是什么感觉，整件事只是不断地在我脑海重演。
"In a constant rhythm, as the car lurches forward and then stops short, snapping my head back and forth like a rap singer."
在固定的节奏下，车子一会儿突然向前，一会儿急刹车，我的脑袋就像个饶舌歌手一样前摇后晃。
I set off on this trip with the vague expectation that three months of navel-gazing would clear my head of the frustration, that is for me at least, the constant shadow of middle age.
我出发旅行时，有一种模糊的期盼：三个月的内心自省会驱走我心里的失落感，对我来说，至少是那挥之不去的中年阴影。
India’s income per head, for example, was about $3, 200 in 2009 (holding purchasing power constant across time and between countries).
例如，印度的人均收入在2009年大约是3200美元（不管是跟以往相比还是各国家之间，购买力都没变。）
Through dividing electronic expansion valve from evaporator system and based on constant gain of superheat open loop rule, the compensation theory of valve head was analyzed.
通过将电子膨胀阀与受控对象(蒸发器)细化分开来，并依据恒定开环增益准则从理论上分析了阀头补偿原理。
This system can implement constant-head, constant flow-rate and transient-pulse permeability tests of specimen under high confining and pore pressures.
该装置可在高围压及高孔隙水压力条件下采用定水位法、定流量法或压力脉冲法测试岩石的渗透系数。
Generating according to constant water head could improve the hydropower plant's economy benefit.
恒水头发电能使单位体积的水发出更多的电能，从而提高水电厂的经济效益。
The "capping head" is adopted magnetic-constant-torque device to ensure the high capping quality and without damages.
封盖头采用恒扭矩装置，以确保封盖质量；且不会损坏瓶盖。
Factors affecting constant pressure difference control method and advantages and disadvantages of the control plan are analyzed theoretically through pipe system head curve and pump performance curve.
根据管道水力特性曲线与水泵的性能曲线，运用理论分析的方法，对影响末端定压差控制方式的因素和该控制方案的利弊进行了分析。
The thread seemed almost afraid to be seen, emitting a frail, constant light as it came down to just above Kandata's head.
仿佛怕人看到似的，细细一线，微光闪烁，恰在自己头上笔直垂落下来。
The first-of-its-kind device, made by Olympic Medical Corp. of Seattle, works by maintaining a constant flow of chilled water through a cap placed atop a newborn's head.
由西雅图奥林匹克医学公司生产的该种新式设备，其工作原理是将冷却水不间断地流过置于新生儿头部的帽子。
This paper explained the principle of constant-pressure water supply on the basis of characteristic curve of pipeline resistance and water pump head.
本文首先根据供水系统的管阻特性曲线和水泵扬程特性曲线，分析了恒压供水的原理；
It is divicled into three kinds:no-heating style, heating style, constant temperture style some of which add two-way, multi head mixing function.
磁力搅拌器可以分为不加热型、加热型、恒温型三类，有的机型增设了双向、多头搅拌功能。
It is divicled into three kinds:no-heating style, heating style, constant temperture style some of which add two-way, multi head mixing function.
磁力搅拌器可以分为不加热型、加热型、恒温型三类，有的机型增设了双向、多头搅拌功能。
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