As gravity field, magnetic field, electric field and reismic wave field are all physical fields, their object function, reverse function and compound function a
Some extraditional types-black rock series types of platinum group element (PGE), gold and silver mineralization occurrences were found in the Lower Cambrian in
Radon concentrations in high background radiation areas in the south are higher than those of others in China, especially 220Rn concentration is significantly h