“沙层”的概念、定义、翻译、参考文献-科学参考

科学参考收录了1248194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。

单词	沙层
释义	沙层 sand bed
随便看	second-degree erythema second-degree parabola second degree surface second-delay blasting cap second delay electric detonator second derivation control second derivative second derivative action second derivative gravity anomaly second derivative spectroscopy secondderivative test second development second display second division segregation second DO second edition second electron lens second equation of Maxwell second evaporator second explosion second filial second fixed head disk second flow second-foot second-forbiden spectrum