制作过程中加入吊白块，用酸碱滴定法分别测定水豆腐压滤液、离浆液和蒸馏液中甲醛含量。
The formaldehyde contents in tofu filtrate, liquid separated from beancurd and the distillate of beancurd were measured by acid-base titration.
通过分批加入尿素的方法，将尿素、甲醛、阻燃剂P800和硼砂反应制备阻燃脲醛树脂。
The fire-retardant urea-formaldehyde resins were synthesized with urea and formaldehyde and P800 and borax.
以苯酚、甲醛为主要原料合成了可发性碱催化酚醛树脂，并加入匀泡剂、发泡剂和固化剂制备了酚醛泡沫。
Phenolic resin was synthesized mainly from phenol and formaldehyde as raw material. The phenolic foam was prepared by adding foam stabilizer, foaming and curing agent.
在制备方法上利用聚乙烯醇缩甲醛溶液高温析水的性质，直接加入高岭土、轻质碳酸钙制胶，简化了工艺。
By using property of separating out water at high temperature for polyvinyl alcohol formaldehyde solution, kaolin and light calcium carbonate can be directly added, and technique is simplified.
采用加入疏水性树脂和甲醛捕捉剂的方法对脲醛树脂进行了改性。
The water resistant low formaldehyde content urea-formaldehyde resin was prepared by adding hydrophobic resin and formaldehyde collecting agent.
作者发现，在反应中加入适量乙醛代替部分甲醛、可明显提高缩醛胶的性能。
The authors find that the addition of appropriate amount of acetaldehyde to replace a part of formaldehyde distinctly improves the properties of the acetal adhesive.
结果表明：偶联剂的加入，不仅使GF均匀分布在聚甲醛(POM)基体中，而且使复合材料的结构及性能有较大的改善。
The results show: the addition of GF not only makes the coupling agent distribute in POM matrix uniformly, but also improves the structure and properties of the composite greatly.
固定细胞-把16%甲醛直接地加入培养基获得一个1.5%甲醛的最后一个浓度。
Fix cells - Add16% formaldehyde directly into culture medium to obtain a final concentration of 1.5% formaldehyde.
结果表明：偶联剂的加入，不仅使GF均匀分布在聚甲醛（POM）基体中，而且使复合材料的结构及性能有较大的改善。
The effects of content of glass fiber(GF), kind and content of coupling agent on the mechanical properties of GF/POM composite were studied.
通过对脲醛树脂的合成改性，降低了树脂中游离甲醛含量，减小了毒性，加入改性剂后增加了树脂韧性。
Free formaldehyde content in resin is reduced through beetle modification, and the toxicity is thus reduced. The toughness of resin has been increased after adding modifier.
研究了强碱氢氧化钾加入量和溶剂等对反应的影响，发现随着碱浓度的增加，邻硝基甲苯的转化率增加，邻硝基苯甲醛的收率先增后降。
The effect of strong base, KOH, was studied and it was found that the conversion of o-nitrotoluene increased if the amount of KOH increased.
在250毫升。三口，圆底烧瓶用机械搅拌器提供放置二十一点二克。（0.2摩尔）苯甲醛，和18.6克（0.2摩尔）苯胺的加入快速搅拌。
In a 250-cc. three-necked, round-bottomed flask provided with a mechanical stirrer is placed 21.2g. (0.2 mole) of benzaldehyde , and 18.6 g. (0.2 mole) of aniline is added with rapid stirring.
在250毫升。三口，圆底烧瓶用机械搅拌器提供放置二十一点二克。（0.2摩尔）苯甲醛，和18.6克（0.2摩尔）苯胺的加入快速搅拌。
In a 250-cc. three-necked, round-bottomed flask provided with a mechanical stirrer is placed 21.2g. (0.2 mole) of benzaldehyde , and 18.6 g. (0.2 mole) of aniline is added with rapid stirring.
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