伦琴当量人(rem)
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人体伦琴当量
If an astronaut had been on the Moon at the time, they might have received a 400 rem (Roentgen Equivalent Man) radiation dose.
BBC: NEWS | Science/Nature | Spacecraft go to film Sun in 3D
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。