a r X i v :c o n d -m a t /0104347v 1 [c o n d -m a t .s t r -e l ] 19 A p r 2001Valley Splitting in Si-Inversion Layers at Low Magnetic FieldsV.M.Pudalov a ,A.Punnoo b ,G.Brunthal
1.The ponderosa pine is _____ of most of the timber ud by forest product firms in the Black Hills of South Dakota. (A)the source凉面怎么做 (B)as source (C)the source which (D)beca