Tp the time required for one-half of the atoms in a group of radioactive atoms to decay.

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She has also determined the oxygen and other elements half-lives, published a series of about radioactive has been importantly discussing.

她還測(cè)定了氧及其他元素的半衰期，發(fā)表了一系列關(guān)于放射性的重要論著A爱片免费视频。

Score was judged by conditions before and after therapy through half-quantitation grading method according to radioactive distributed defective pulmonary segments combined with radioactive degree of rarefication.

根據(jù)放射性分布缺損的肺段及放射稀疏程度相結(jié)合的半定量打分法對(duì)治療前后進(jìn)行評(píng)分日韩中文字幕露脸视频网站免费。