By using R matrix method total and single differential Cross sections for electron impact ionisation of atom Na at 20,50,and 100 eV incident energies in the distorted wave and the Coulomb Born approximations.是什么意思_By using R matrix method total and single differential Cross sections for electron impact ionisation of atom Na at 20,50,and 100 eV incident energies in the distorted wave and the Coulomb Born approximations.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句