Study of the Generalized Law of Alternating Polarity
he feng luo yifan (dept. of chem. ; sun yat- sen univ of medical sciences; guangzhou 510089)zheng kangchen (dept; of chem. ; zhongshan univ. ; guangzhou 510275)
Reflections on Computer - Assisted Instruction
zhao chenylin (department of physics shaoyang teacher s college shaoyang hunan 422000)ye yonghua (department of physics chenzhou teacher s college chenzhou hunan 423000)