MgO改性提高对二乙苯选择性最为明显.Silylation, P modification and MgO modification can improve p - DEB selectivity greatly.指出高效、节能的分子筛吸附分离法是分离二乙苯的最佳选择.The best choice for separating diethylbenzene is the adsorptive separation by zeolite...
介绍一种新型电容测微仪.A new type of capacitance micrometer is introduced.便携式智能数字测微仪是一种新型的高精度计量仪器.The portable intelligent digit display micrometer is a new type of micrometer with high accuracy....