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0000 GENERAL0270 Numerical Simulation of Bistatic Scattering from Fractal Rough Surface By Fast Forward-Backward Method……………………Li Zhong-xin, Jin Ya-qiu (804)0320 Equations of Motion of Variable Mass Nonholonomic Dynamical Systems in Poincaré-Chetaev Variables………………Qiao Yong-fen, Zhao Shu-hong (810)0320 Symmetry and Invariant in Generalized mechanical Systems in the High-Dimensional Extended Phase Space