商业上采用的以镍作催化剂的氢化有两种.Commercially two main types of hydrogenations are carried out with Nickel catalyst.抑制剂和促进剂能影响氢化速率.Inhibitors and promoters may affect the rate of oxxidution.用六氢化邻苯二酸酐加入到邻苯二酸酐中,可使其放热反应减慢.Exothermic reac...
汤姆住在一间窗户朝西的房子里.Tom lived in the room with a window facing west.冷色系用在朝西的厨房 、 门厅和其他地方,下午的热量是个问题.Use cool colors in west - facing kitchens, porches and other areas where afternoon heat is a problem....
The best way to represent the isotactic structure is with molecular models.表示等规结构的最好方法是用分子模型.Polyacetaldehyde may exist in atactic, syndiotactic and isotactic forms.聚乙醛可以以无规, 间同和全同形式存在.Polyacetadehyde may exist in atacti...
His signature was an incomprehensible scrawl.他的签字是令人看不懂的涂鸦.Don’t scrawl on the wall.不要在墙上乱涂。This letter must be from Frank;I recognized his scrawl.这封信一定是弗兰克写来的, 我认得他那潦草的笔迹。This letter must be from Frank; I recognized his...
"I have never knowingly exposed any patient to needless risks," he said.他说：“我从未故意将任何病人置于不必要的风险境地。”Tone down your kamikaze tendencies and take more prudent risks.别那么玩命，冒险时要谨慎些。They have never been actively encouraged to t...
他们时常陷入枯燥的日常事务之中。All too often they become enmeshed in deadening routines.上班时，他淹没在枯燥乏味的会海中。At work, he was chained to a system of boring meetings.新闻广播准确可靠但却非常枯燥。Broadcast news was accurate and reliable but deadly dull....