The material is readily prepared by reaction of formaldehyde and hydrazine.这种物质很容易由甲醛和肼反应而得到.Formaldehyde slowly inactivates many viruses.甲醛能慢慢使多种病毒失去活性.Sulfur dioxide and formaldehyde both produce irritation.二氧化硫和甲醛都可产生...
The carbon microfiltration membranes were prepared by pyrolysis of a home - made thermosetting phenol - formaldehyde ( PF ) resin .实验合成了球形热固性 酚醛树脂 微粒,并以此为原料制备了微滤炭膜.The preparation and property of urea - formaldehyde resi...
有形的检查或检测也可代替正式的听证.Physical inspections or tests may also take the place of formal hearings.需要的不是有形的永久性, 而只是理想的永久性.No physical permanence, but only an ideal one, is necessary.我猜想,思特里克兰德在有形的事物上模模糊糊地看到某种精神意义.I fancy that St...