数学奥林匹克初中训练题(58)

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The selective oxidation of propane over vanadium phosphorus oxide(VPO) catal yst has been investigated by using chromatography in a pulse reactor. The
实验振动测试可以评价机床的抗振性能并对机床的振动情况做出分析诊断,因而成为解决机床振动问题的关键手段之一.针对某超高速外圆磨床的振动问题,采用实验振动测试技术,制定
The catalytic decomposition of dichlorodifluoromethane(CFC 12) in the presence of water vapour has been carried out on WO 3/Al 2O 3 prepared by impregnating
Title polymeric complex(EPU Eu(Ⅲ)) was obtained from triisobutoxy euro pium Eu(C 3H 7O) 3 with electropolyurushiol in isobutyl alcohol. The struct
Two polymeric chelates of 8 dihydroxyquinoline synthesized from biquinoline monomer with zinc acetate and copper acetate, respectively, are reported. The effec
A series of trifluorovinyl aryl ethers were synthesized by dehalogenation of 2 bromo 1,1,2, 2 tetrafluoroethyl aryl ethers which were prepared
The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group
LaFeO 3 nanocrystals were synthesized by both citric acid and microemulsion methods. Their structures, sizes and morphologies were investigated by XRD and TEM.
7-苯乙酰氨基去乙酰氧基头孢G酸(简称头孢G酸,7PAADCA),是由青霉素工业盐制备7-氨基去乙酰氧基头孢G酸(7-ADCA)的中间体.
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