To use the water resources reasonably in the midstream of Yinma River is of great significance to Changchun City which is short of water. With the runoff data o
The average size of the sand of dune in the vicinity of Tumen River is 0.12~0.30 mm, its standard deviation is 0.45~0.99 φ and the frequency cumulative distribut
The geochemical classification proposed by Goldschmidt was based on meteoritic analysis and elemental partition in blast furnace. There are many surprises when