一般安全阀全回流时间不得超过三分钟。
General relief valve total reflux time shall not exceed 3 minutes.
使用这种方法的关键在于选择合适的溶剂、足够的碱浓度及加热回流时间。
The key to the use of this technique lies in selecting appropriate solvents, a certain basicity and time enough for return flow in heating.
着重研究了光刻胶的前烘胶温度、回流温度、回流时间对回流效果的影响。
The impact of prebake temperature, reflow temperature and reflow time on the effect of pr reflowing is studied.
但是，D博士说：如果咳嗽持续时间长达八个星期以上，你应该是看医生，因为它可能是如哮喘、胃酸回流的一个征兆。
But if your cough persists longer than eight weeks, you should see your doctor because it could be a sign of something else, such as asthma or acid reflux, says Dr. D.
商业票据和一些公司债是短期的，现金可以在短时间内回流到央行。
Commercial paper and some corporate bonds are of short duration, returning cash to the central Banks over fairly short horizons.
考察了分离温度、时间和回流比等因素对分离效果的影响。
The effects of separation temperature, time and reflux ratio on separation efficiency were investigated.
采用正交实验，考察了原料投料比、回流反应时间、催化剂等因素对合成的影响。
The effects of feed composition, reflux reaction time and catalyst concentration on PPTD yield were investigated.
回流比、进料浓度、周期循环时间均对半连续热参数泵分离效果产生影响。
Reflux ratio, feed concentration and cycling time have effect on the separation.
实验表明，在加入溶剂后全回流操作一段时间后，塔顶浓度上升基本稳定，而且在产品采出过程中塔顶浓度也维持稳定。
The experiment showed that the overhead concentration rises to a primarily stable value after the solvent is introduced and keeps constant during the product withdrawing.
为了确定运行条件的影响，采用搭建CAST小试试验台对曝气时间、DO、回流比、排水比进行了研究。
In order to determine the influence on account of operating conditions, aeration time, DO, reflux ratio, water drainage ratio were studied by using small CAST test-bed.
超光速不会导致时间回流。
结果：对提取率影响主次次序为回流温度、提取时间、溶剂倍量。
Result: The order of factors which affected extracting was: refluxing temperature, extraction time, solvent volume.
时间不会仅仅因为他的死而回流。
研究了回流除氯时间、温度、吸附剂用量对去氯率的影响，以及微波消解条件、酸介质、催化剂对COD测定的影响。
The effects of reflux time, temperature, amount of adsorbent on the efficiency of removal of Cl - and the microwave digestion conditions, acid medium, catalysts on the COD determination are discussed.
实验表明，扩张流塔板存在严重回流和滞流现象，收缩流塔板面液体停留时间有明显差异。
Experimental results showed that highly recirculation flow area exists on the sidetocenter tray and clear difference of the liquid residence time exists on the centertoside tray.
数值结果表明：1）在微泵扩散管的过流截面上流速有时间相位差和回流现象。
The numerical results indicate that 1) Phase differences in time of flow velocities and backflows occur across section of diffuser connecting to pump chamber;
获得了该塔在全回流及部分回流条件下的全塔效率，固定回流比间歇精馏下的塔顶、塔釜温度及浓度随时间的变化曲线等。
The changing curve of temperature and concentration in top and bottom with time in fixed reflux ratio and batch distillation, were also obtained.
结论同热回流方法比较，超高压提取黄芪中皂苷类成分，具有效率高、时间短和能耗低等优点。
CONCLUSION Compared with heat reflux extraction methods, the UPE of astragaloside IV from Radix Astragali is efficient, less extraction time, lower energy consumption and so on.
利用二级处理的回流污泥进行接种对好气滤池的启动没有加速作用，相反，还会延迟启动时间。
Seeding activated sludge from a secondary treatment pant can not help startup, and on the contrary, it may delay a startup.
结果3种提取方法中回流提取的提取物中岩白菜素含量最高，正交实验优化条件为：料液比为1：15，提取时间为1.5 h，提取次数1次。
ResultsThe optimum parameters of extracting bergenin were as follows: extracting for 1.5 hours, one time, and 1:15 of the ratio of material and solvent.
结果3种提取方法中回流提取的提取物中岩白菜素含量最高，正交实验优化条件为：料液比为1：15，提取时间为1.5 h，提取次数1次。
ResultsThe optimum parameters of extracting bergenin were as follows: extracting for 1.5 hours, one time, and 1:15 of the ratio of material and solvent.
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