碳的诸多同位素the many isotopes of carbon碳的化合价是4价。Carbon has a valency of 4.通过环氧化和氧化就得到外消旋的含十八个碳的昆虫返动激素.Epoxidation and oxidation gave the racemic C 18 - juvenile hormone....
Editors and academics, through critical quarterlies, through college courses, support its orthodoxies.编辑和学术界人士通过评论刊物, 通过大学的课程, 维护它的正统性.Some academics fret that the secret aim is to privatise universities.一些学者不快地称其秘密目的是将大...
They had seen him trawling and therefore knew that there were fish.他们曾见过他用拖网捕鱼，因此知道那里有鱼。The boat were out trawling the bay.渔船已出海,在海湾用拖网捕鱼.A team of officers is trawling through the records of thousands of petty thieves.一...