activity quotientactivity ratio活度: activity比: 2活度比率: activity ratio样品-本底放射性活度比,样品本底活度比: sample to background activity ratio活度: [化学] activity◇活度系数 activity coefficient下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:活度比,即可在微信中查询翻译