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<正> Acknowledgements:This work was done in collaboration with Z.H.Xiong,D.Wu,Z.V.Vardeny andX.G.Li,and supported by NSF,ACS/PRF and ONR.(?)Spintronics and Semiconductor Spintronics(?)Spin Injection and Transport in Organic Spin Valves●Low-field magnetoresiStance:coherent spin tranSport(?)Magnetic Field Dependent Carrier Injection at Interfaces●High-field magnetoresistance:field-dependent carner injection(?)Summar