查询词典 a column of water

Lift-type check valve structure improvement Lift Check valves, also known as the end, it can maintain the required suction pump to stop the water Globe Style Silent Check Valves column; the valve structure is characterized by improvements in the main valve between the valve flap and valve stent slow addition of a Vice-valve closed.

升降式止回阀结构改进升降式止回阀又名底阀，它可以保持停泵时抽吸所需水柱；该阀结构改进的特点是在主阀阀瓣与阀体支架间增设一缓闭副阀。

The gravity of this water column continuously produces the vacuum and so a vacuum pump is not needed.

水柱的重力不断地引起真空，所以真空管是不需要的。

The Veliger larvae of Crassostrea gigas swan regularly in the water column under the ambient pressure, either in a vertically orientated lineal or spiral pathway.

在正常大气压下，太平洋牡蛎面盘幼虫的游泳较为舒缓，压力提高时，表现为快速的直线运动或螺径小而螺距大的螺旋运动，并出现更频繁的下沉行为，表明幼虫的紧张度已提高。

The separation of optical isomers of 2, 2'-dihydroxy-1, 1'-binaphthyl and 2, 2'-diamino-1, 1'-binaphthyl was studied by reversed-phase high performance liquid chromatography on a chiral stationary phase consisting of-hydroxypropyl-β-cyclodextrin (Cyclobond Ⅰ 2000 SP)using methanol/water as the mobile phase. The effects of mobile phase ratio, flow rate and column temperature on separation of optical isomers of DHBN and DABN were investigated.

在S-羟丙基－β-环糊精手性柱(CyclobondⅠ2000 SP)上用反相高效液相色谱法研究了2，2'-二氨基－1，1'-联萘和2，2'-二羟基－1，1'-联萘光学异构体的分离，考察了流动相组成、流速以及柱温等对联二萘胺和联二萘酚光学异构体分离的影响。

A simple, selective and sensitive method was investigated for simultaneous determination of anions (SO2－4, Cl－, NO－3, F－) and cations (Na＋, NH＋4, K+, Mg2＋, Ca2＋) by single-column ion-exclusion-cation-exchange chromatography with conductometric detection. DL-malic acid-methanol-water was used as an eluent.

采用单柱离子色谱系统和电导检测的方法，首次以DL-苹果酸-甲醇水溶液为淋洗液，简便、有效地同时分离、检测了溶液中SO2-4、Cl-、NO-3、F-、Na+、NH+4、K+、Mg2+、Ca2+9种离子。

The experiments were conducted in a distillation column simulator with sieve trays by using air and mixtures of liguid paraffine and water.

以空气和油、水混合物为介质，在冷模塔内进行筛板上气、液、液三相流动的操作工况及其转变的研究。

Three analytical solutions are given including the wet front analysis solution of double medium soil column,the analytical expression of piezometric tube water head and saturation for steady state and the analysis solution of seepage in unconfined aquifer with a periodic boundary condition.

推导了双介质土柱表层水入渗的下渗锋面解析表达式、稳定状态时测压管水头分布与饱和度分布的解析表达式，并给出了有周期性边界条件的有限潜水层内渗流自由面的解析表达式。

The hydrodynamics of the new employed gradient ringent trapezoidal valve tray s are experimentally studied with the air-water system in a 500 mm×500 mm quadrate column.

采用空气-水系统，在500 mm×500 mm的方形塔内，对新开发的斜孔梯形浮阀塔板的流体力学性能进行了试验研究，测定了塔板压降、泄漏和雾沫夹带。

A fully automated simultaneous determination of nitrate and nitrite in water samples by sequential injection analysis based on the Griess diazo-coupling reaction and the formed azo dye for nitrite at 540nm and reduction to nitrite using coppered cadmium column.

用顺序注射分光光度法，通过一次进样。同时测定硝酸根和亚硝酸根。亚硝酸根是根据格里斯重氮－偶联反应，形成偶氮染料后在波长540nm下进行检测。而硝酸根则通过镀铜镉粒还原柱还原为亚硝酸根后进行测定。

In the commonly used positive cycle of drilling, the mud pump is to rinse the surface with water medium ─﹑ mud or polymer washing fluid at a certain pressure, through the high-pressure hose taps and drill column ﹑ center hole in the bottom of the direct-drill in order to achieve Cooling ﹑ be cutting down the drill cuttings removal and transport to the surface purpose.

在常用的正循环钻探中﹐泥浆泵是将地表冲洗介质─清水﹑泥浆或聚合物冲洗液在一定的压力下﹐经过高压软管﹑水龙头及钻杆柱中心孔直送钻头的底端﹐以达到冷却钻头﹑将切削下来的岩屑清除并输送到地表的目的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。