She typed an original and two carbons.她用打字机打出了原件及两份副本.He inserted the paper and two carbons.他放入了那张纸和两张复写纸。Isolable carbocyclic compounds contain seven or fewer carbons in the cycle.可分离的碳环化合物环内含七个或七个以下的碳....
Ordered mesoporous carbons possess good conductivity, strong framework and high surface areas , showing great adsorptioncatalysis.介孔碳材料具有良好的导电性 、 很强的骨架刚性以及大的比表面积.He inserted the paper and two carbons.他放入了那张纸和两张复写纸。The va...