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词汇
白堊系
释义
白堊系
bái è xì
中生代地層構造之一。指出現於侏儸系之後、第三系之前的岩石,距今約有六千餘萬年至一億三千餘萬年。當時歐洲地區普遍沉積顯著的白色石灰岩,因而得名。
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senior system
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senior talent
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senior third officer
senior three
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更新时间:2025/2/8 10:34:30