查询词典 backflow

The main factor which influences the heat exchange performance of air cooled condenser is the backflow or recirculation of hot air caused by the environmental big wind.

摘 要：影响空冷凝汽器换热性能的主要因素是环境大风所造成的热风回流或热风再循环。

This would create an air gap to eliminate any possible backflow.

为了防止可能的回流，将需要安装一个气隙。

The new HP package contains quality Watts components … including the new AS-B Bronze Air Scoop and the B911S Combination Bronze Fill Valve and Backflow Preventer.

最新的HP组件包内含优质的美国瓦茨部件，包括：新型AS-B青铜导气罩和B911S青铜进水阀和防倒流装置组合件。

This paper analyzed the application case of the components such as anti-backflow equipment or air-pressure tank that using in the pipe network add-pressure water supply equipment.

本文对管网叠压供水设备中的倒流防止器和气压罐等器件的应用情况进行分析。

In this paper, through a series of experiments, two series of quaternary-ammounium Gemini surfactants were synthesized, namely the pair alkylene double quaternary ammonium salt surfactant m-s-m·2Br and the pair the alkylene double quaternary ammonium salt surfactant -s-·2Br. We has carried on the attribute with the infrared spectrum to its structure, and to affected the factor which the synthesis pair the alkylene double quaternary ammonium salt surfactant responded to carry on the discussion. We has discovered the synthesis pair the ethylene double quaternary ammonium salt surfactant m-2-m·2Br optimum condition: The bromo alkane and a tetramethyl ethylene diamine mole of ratio is 3.0: 1.0, makes the solvent by the ethyl alcohol, 80℃ under responds for 48 hours in the backflow temperature; Synthesis pair alkylene double quaternary ammonium salt surfactant 12-S-12 ·2Br optimum condition: 12 tertiary amine and 1, 3- propylene dibromide (1, 4- two bromines butane) a mole of ratio is 2.2: 1.0, makes the solvent by the ethyl alcohol, responds for 48 hours in the constant temperature 80 ℃ under backflow.

本文通过一系列的实验，合成了两个系列的Gemini型表面活性剂，即双烷撑双季铵盐表面活性剂m-s-m·2Br和双烷撑双季铵盐表面活性剂-s-·2Br，用红外光谱对其结构进行了表征，并且对影响合成双烷撑双季铵盐表面活性剂反应的因素进行了讨论，找出了合成双乙撑双季铵盐表面活性剂m-2-m·2Br的最佳条件：溴代烷与四甲基乙二胺的摩尔比为3.0：1.0，以乙醇作溶剂，在回流温度80℃下反应48小时；合成双烷撑双季铵盐表面活性剂12-s-12·2Br的最佳条件：十二叔胺与1，3-二溴丙烷(1，4-二溴丁烷)摩尔比为2.2：1.0，以乙醇作溶剂，在恒温80℃下回流反应48小时。

According to the factors that affect the talented person backflow, construct the model about talented person backflow.

根据影响人才回流的各种因素，创造性的构建人才回流的模型。

The development mechanisms of backflow precipitation are analyzed with the reasonable simulation results. The results show that dynamical frontogenesis plays a very important role in the development of backflow snowstorm. The frontogenetical secondary circulation directly causes the snowstorm.

在回流暴雪形成与发展的过程中，动力锋生机制发挥了重要作用；其产生的锋面次级环流是造成这次暴雪的主要原因；降水过程中，雨雪相态的转变与温度廊线有直接关系，随着降水由雨转为雪，雪水混合比增大迅速且其高度有所降低。

The N9-CD is designed to prevent high hazard backsiphonage backflow and low-head backpressure (10ft. or less) from contaminating the potable water supply. The N9-CD is ideally suited to prevent backflow associated with hose connections and may be screwed directly to the sill cock, yard hydrant or wall hydrant.

N9-CD适用于防止高危害反虹吸回流和低压头反压力（3米以下）回流污染饮用水供应系统。N9-CD特别适合于防止软管连接有关的回流，可以直接螺旋连接到洒水龙头、庭院消防栓或墙式消防栓上。

In comparison with typical Orbal oxidation ditch, the modified Orbal oxidation ditch illustrates more concisely and compactly with no need to construct an independent sedimentation tank, which can decrease 1/3 to 1/2 of land occupation; and the backflow of sludge and nitrified water can be hydraulically processed, which saves the energy consumption for dynamic backflow.

与典型奥贝尔工艺相比，改良型奥贝尔工艺简洁紧凑，无需建造单独的二沉池，占地可减少1/3～1/2；而且污泥和硝化液回流都能依靠水力回流，节省了动力回流的能量投入。

For protection against backpressure backflow, install Watts Series 909 or Series 009 reduced pressure principle backflow preventers.

对于反压力回流保护，需要安装美国瓦茨909系列或009系列减压原理防回流阀。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。