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...
只要我们能作记号,找到回来的路,我就跟你去. ”I will if it's where we can blaze our way to it and not get lost. "他用粉笔在地板上作记号.He marked the floor with chalk.在CJ's的房子外面在红色的作记号的人之上行走.Step onto the red marker outside CJ's house....