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奥陶纪
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奥陶纪
Encyclopedia
理学
古生代
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Ordovician Period
奥陶纪
古生代第二个纪,约开始于4.85亿年前,结束于4.44亿年前。
Biology
Ordovician
奥陶纪
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primitive recursive isomorphism
primitive recursiveness
primitive recursive operation
primitive recursive predicate
primitive recursive relation
primitive recursive scheme
primitive recursive set
primitive recursive transformation
primitive reflex
primitive regular group
primitive relation
primitive religion
primitive representation
primitive representation space
primitive right triangle
primitive ring
primitive root
primitive root of unity
primitive sculptures of China
primitive semigroup
primitive semiperfect number
primitive sentence
primitive septum transversum
primitive sequence
primitive set
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