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放射性元素
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tennessine
人工放射性元素,元素符号Ts,原子序数117,半衰期最长的同位素的质量数294。属周期系ⅦA族,是已知第二重的元素。以合成该元素的美国橡树岭国家实验室、范德堡(Vanderbilt)大学等研究机构所在的田纳西州(Tennessee)命名。曾被称为117号元素(ununseptium),符号Uus。
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focusing condition
focusing control
focusing criterion
focusing cup
focusing current
focusing defect
focusing distance
focusing electrode
focusing event theory
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focusing glass
focusing glass measuring distance
focusing hood
focusing knob
focusing lens
focusing magnet
focusing magnetic field
focusing magnifier
focusing method
focusing mount
focusing of sound
focusing on infinity
focusing optics
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