丁二烯

By means of Tyndall effect,electron microscope and ultrafiltration it is found that the catalyst dispersing in butadiene-hydrogasoline solution exists in little particle form and that the particle sizes are from to 100mm.

通过Tyndall效应、电镜观察和超过滤实验，证明镍催化体系在溶有丁二烯的加氢汽油中以小颗粒分散，粒径在1～100nm之间，为胶体催化剂，属于高度分散的多相催化体系。

By Tyndall effect, electronic microscopic and super-filtering experiments, it was proved that V3-Al2Cl catalyst is a colloidal catalyst in butadiene-containing toluene solvent, which belongs to a multiphase catalyst. The diameters of the catalytic particles are from 1 nm to 100 nm, and the active sites are on the surface of the amorphous colloidal particles.

通过Tyndall效应、电镜观察和超过滤实验，证明了在溶有丁二烯的甲苯溶剂中V3-Al2Cl催化体系以小颗粒分散，粒径在1～100 nm之间，为胶体催化剂，属于高度分散的多相催化体系。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。