问答题

在中性点不接地的三相三线制系统中采用的保护接地方式是（）

答案：正确答案：(以下答案任选其一都对)IT系统；IT

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When an atom or molecule absorbs an X-ray photon, an electron can be ejected. The kinetic energy (KE) of the electron depends upon the photon energy (hν) and the binding energy (BE) of the electron (i.e., the energy required to remove the electron from the surface). By measuring the kinetic energy of the emitted electrons, it is possible to determine which elements are near a material’s surface, their chemical states and the binding energy of the electron.

答案：正确