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事实上单独某一个波长的射线就可以产生好象一束单色光一样的纯净的伦琴射线。
Instead, a single wavelength can be selected to produce the X-ray equivalent of a pure-colour beam of light.
youdao
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事实上单独某一个波长的射线就可以产生好象一束单色光一样的纯净的伦琴射线。
Instead, a single wavelength can be selected to produce the X-ray equivalent of a pure-colour beam of light.
youdao