The specimens have large absorption and emission cross section.
样品具有较大的吸收和发射截面。
When the upper state population is not reversed, the channel with greater ratio of emission and absorption cross-section has greater competitive advantage.
当上能级粒子数处于未反转分布态时，具有较大的发射截面与吸收截面比值的波长信道拥有相对较大的增益竞争优势。
Field emission scanning electron microscope (FESEM) has been used to investigate the fine structure of Fe-based metal film interface and its cross-section.
采用场发射扫描电子显微镜(FESEM)，研究了铁基金属包膜界面及其断面的精细结构。
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