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Number (1): Everything in this space must add up to 1. The answer is 4-0, placed horizontally; 0-0, placed vertically; 1-1, placed horizontally.
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(八)放射源,是指除研究堆和动力堆核燃料循环范畴的材料以外,永久密封在容器中或者有严密包层的放射性材料。。safew官方版本下载对此有专业解读
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