题目内容
吸收剂量是指单位质量物质接收电离辐射的平均能量。
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曝光时间指示的偏离是用于检测放射科技师工作时间的准确性。
Why are college graduates in the video called a dependent generation and what can account for it?
After watching the video, what is your idea or reflection upon the difficulties and struggles the graduates confront after graduation?
能缓冲减振,并能起到过载安全保护作用的是( )。
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