早知文理百科

辐射的单位通常用瓦特每平方米（W/m²）或者分贝毫瓦（dBm）来表示。辐射的具体数值取决于发射源的功率和距离等因素。较常见的辐射含量大致如下： - 一般室内...

have ...to do with 与…有关. 例句What does it have to do with you?与你何干? have nothing to do with 与...没有关系. 例句You do not have to worry,sin...