In cryptography, a cipher produced by a composition of a number of substitution and transposition ciphers. A method of 2228 litho-density tool's calibration first success ratio 密码学中,由替代密码和置换密码结合使用而构成的一种密码。2228岩性密度仪刻度一次成功率的技巧
The Study for the composition of substitution fluid in high volume hemofiltration 高容量血液滤过治疗置换液配方初探
XRD, SEM are employed to study the construction and composition of the substitution, the complex permittivity and complex permeability of the samples between 2~ 18 GHz are tested through coaxial method by a network vector analyzer. 通过XRD、SEM等手段研究了取代物的结构和组成:采用了网络矢量分析仪,通过同轴法测试了各取代物在2~18GHz频率范围内的复介电常数和复磁导率;