回流

Backflow preventers must be installed in high-visibility locations in order to allow for immediate notice of telltale discharge or other malfunction.

防回流阀应该安装在显眼的位置，以便能够立即注意到排放和其他故障警报。

Watts Dual Check Backflow Preventers can be specified in many different combinations of connection types, sizes, and union options.

美国瓦茨双止回防回流阀可以按照连接类型、通径和接头构成许多不同的组合。

Excess 40% potassium hydrate solution was added into the triblock copolymers PMA-b-PS-b-PMA solution in THF.

将制得的三嵌段共聚物PMA-b-PS-b-PMA在四氢呋喃中溶解，加入过量的40%氢氧化钾溶液，在75℃下回流48小时。

Results the factors in the pre-experiment have obvious effects. the best method was as follows: powder of 200 mesh, reflux, macroporous resin column chromatography.

结果预试验中各因素对结果均有影响，最好的方法为：80目细粉，回流，大孔树脂柱层析。

Placing the check valve in parallel with the pressure-reducing valve allows free return flow when the weld cylinder retracts.

将止回阀与减压阀门允许自由回流焊接钢瓶时收回。

Placing the check valve in parallel with the pressure-reducing valve allows free return flow when the weld cylinder retracts.

将止回阀与减压阀并联可在焊接气缸缩回时提供一个自由回流回路。

5 Adjust and determine reflow and wave soldering machine profile for NPD PCB Assembly.

为新产品的线路板调整和制定回流焊/波峰焊温度曲线

The final solution was a dirty yellow-brown color, and it was kept at reflux temperature for 24 h.

最后溶液呈土黄棕色，将其保持在回流温度下24h。

Methods Patient use sole vein pump treat behind the skill to 35 hip department fracture, function its to pinch to the low limbs vein passively promote the blood backset current prevent the blood from depositting the embolism of forming in the deep vein.

对35例髓部骨折术后病人使用足底静脉泵治疗，其作用是对下肢静脉被动挤压促进血液回流，防止血液在深静脉内淤积形成栓塞。

To cycle the action when the oil drain back into the worm gear in the box, separate the return of the oil storage tanks, resulting in increasing number of worm gear box of oil, while the oil inside the oil less and less.

经检查与分析，发现是因蜗轮、蜗杆的密封圈磨损、密封不良，使循环动作的机油在回流时漏入蜗轮箱内，分流了返回储油箱的机油，造成蜗轮箱内的机油越来越多，而储油箱内的机油越来越少。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。