短語(yǔ)詞組短語(yǔ)background equivalent activity 本底等效放射性;本底等效活度background of activity 論壇背景BEA Background Equivalent Activity 本底當(dāng)量放射性background d activity 本底放射性background seismic activity 背景地震活動(dòng)性background activity ratio 樣品本底活性比background d equivalent activity 本底等效放射性background activity level 本底放射性水平;釋義本底放射性水平;本底活度水平Background of the Activity 活動(dòng)背景 返回 background activity