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Encyclopedia
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〔SI基本单位〕
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second
秒
国际单位制(SI)中的时间单位。符号s。当铯频率ΔνCs,也就是铯-133原子不受干扰的基态超精细跃迁频率,以单位Hz即s-1表示时,将其固定数值取为9192631770来定义秒。
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①秒 ②第二
Mathematics
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第二的;其次;秒
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秒
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