Фото: Roman Naumov / URA.RU / Globallookpress.com
Affirmatives; and thereby the excesse of Negatives, standing
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Protons can penetrate up to 30 centimeters, reaching deep-seated tumors. But the delivery of protons in a continuous beam limits the dose rates. Also, proton systems are far larger and more expensive than, say, X-ray machines, which will likely constrain their availability to specialized centers.，详情可参考Line下载
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