We studied the ultraviolet - light - induced absorption ( uv - lia ) coefficient change in the congruent linbo3 crystals doped with mg ( superscript 2 + ) of different concentrations 摘要研究了不同组份掺镁铌酸锂晶体的光致吸收现象。
As one of the greatest essayist of the 19 ( superscript th ) century , charles lamb ' s works is inseparable from his tragic life 摘要作为19世纪英国的最伟大的散文家之一,查尔斯?兰姆的散文与他的孤独凄惨的身世戚戚相关,血肉相联。
Many specialists consider this technique to be one of the keytechniques for manufacturing iron and steel materials in the 21 ( superscript st ) century 该技术已经成功地在商业领域中运行,人们一直在探索将此技术应用于钢铁材料。
Relation h ( superscript * ) on a completely archimedean semigroup is investigated , and some equivalent conditions for h ( superscript * ) to be a congruence are given 摘要给出了完全阿基米德半群上关系h (上标* )是同余的若干等价条件。