“second moment method”的概念、定义、翻译、参考文献-科学参考

单词	second moment method
释义	second moment method Encyclopedia 工学激光参数测量方法释 second moment method二阶矩法利用激光束宽正比于光束横截面上功率密度分布的二阶中心矩这一原理定义、测量光束束宽的方法。
随便看	steel band steel bar steel bar bender steel bar cold-drawing machine steel bar cold-extruding machine steel bar molding steel bar processing machinery and prestressed machinery steel-bars truss deck steel bar truss molding machine steel beam steel beam for emergency repair of railway steel-belt sorter steel bonded cemented carbide steel braced frame steel braced frame structure system steel bridge steel bridge erection steel bridge fabrication steel building structure steel butt welding machine steel cable steel cage forming machine steel catenary riser steel catenary riser ，SCR steel column

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