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白垩纪
释义
白垩纪
Encyclopedia
理学
中生代
释
Cretaceous Period
白垩纪
中生代最后一个纪(第三个纪)。约开始于1.37亿年前,结束于0.65亿年前。白垩纪形成的地层称白垩系(Cretaceous System)。
Biology
Cretaceous
白垩纪
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positive hull
positive image
positive index of inertia
positive infinity
positive integer
positive integral kernel
positive interaction between nutrients
positive ion
positive ion, cation
positive ion mode
positive kernel
positive kurtosis
positive leap second
positive lens
Positive likelihood ratio
positive limit point
positive limit set
positive linear functional
positive linear operator
positive link
positive literal
positive logic
positive logical calculus
positive logical formula
positive lossless storage
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