“first category”的概念、定义、翻译、参考文献-科学参考

单词	first category
释义	first category [`fǝrst `kad·ǝ´gȯr·ē] ^MATHEMATICS 1. A set is of first category if it is a countable union of nowhere dense sets. 2. A set S is of first category at a point x if there is a neighborhood of x whose intersection with S is of first category.
随便看	acoustic insulation acoustic intensity acoustic interferometer acoustic jamming acoustic labyrinth acoustic lens acoustic levitation acoustic line acoustic line of position acoustic logging acoustic Mach meter acoustic mass acoustic mass reactance acoustic measurement acoustic memory acoustic microscope acoustic mine acoustic mode acoustic navigation acoustic nerve acoustic noise acoustic ocean-current meter acoustic ohm acousticophobia acoustic particle detection

科学参考收录了103327条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。