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...
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...
Radium can be used to treat cancer.镭可以用来治疗癌症.Radium can be fixed some distance from its original source.镭在离它的原始母体一定距离上固定下来.He was the discoverer of the element radium.他是镭元素的发现者.Radon is the daughter of radium.氡是镭的子体....
越南战场上用于毁灭林区的“橙剂”，其成分是二氧杂芑。Dioxin was the ingredient in Agent Orange, used to defoliate Vietnam.所形成的水解反应物是二盐酸甲撑二氧胺.The resultant hydrolytic reaction product is methylenedioxyamine dihydrochloride.后者是由二氧杂环戊烷中活化较弱的C -H 键离解而...
A row of small windows jutted out from the roof.有一排小窗户从房顶上突出来。His jaw jutted stubbornly forward; he would not be denied.他固执地扬起下巴, 一副不肯罢休的样子.Gwen jutted her chin forward and did not answer the teacher...格温下巴翘得高高的，没有回答老师的问...
He doesn’t deign to talk to unimportant people like me.他不肯屈尊和像我这样不重要的人说话。He doesn't deign to talk to unimportant people like me.他不肯屈尊和像我这样不重要的人说话.I fear my Julia will not deign my lines.我担心我的朱莉亚不会欣然接受我的书信.Weatherby ...