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...
He's shown considerable delicacy and tact in feeling the public mood.他在体察民情方面表现得相当周到和练达。It's a situation that calls for a blend of delicacy and force.应付这种局面需要刚柔并济。Smoked salmon was considered an expensive delic...
When are you going to start on your journey?你们哪天去旅行 啊 ?Be thrifty and hardworking in whatever undertaking you are to start on.办任何事都要勤俭.Don't think this job a piece of cake. You'll have to rack your brains once ...
脊椎动物脑子的这一部分可分为两部分:脑髓和小脑.This part of the vertebrate brain has two divisions, the medulla and the cerebellum.结论 小脑Purkinje细胞层内存在NYP阳性神经元.Conclusion NPY immunoreactive neurons are located in cerebellum Purkinje cell layer....