网络释义
1)sample-to-background activity ratio,样品-本底活性比2)sample to background activity ratio,样品 本底活性比3)sample to background activity ratio,样品-本底活性比，样品-本底[放射性]活度比4)specific activity of water sample,水样比活性5)background activity,本底放射性，本底活性6)seafloor sample,海底样品
