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dubnium
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人工放射性元素,元素符号Db,原子序数105,半衰期最长的同位素的质量数268。属周期系ⅤB族。以俄罗斯杜布纳联合核子研究所所在地杜布纳(Dubna)命名。
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A Fool
AFOQT
A forsaken woman
a.f. oscillator
AFP
AFPU
AFQT
a-frame loader
a-frame winch
AFRC
A Free and Responsible Press:A General Report on Mass Communication: Newspapers, Radio, Motion Pictures, Magazines, and Books
A French Village
Africa
Africa Drama
Africa hydropower resources
Africa in the Palaeolithic
African-American Dialogue
African American Literature
African ancestor worship
African anthropomorphism
Africana Studies of University of Notre Dame
African black people's music
African Burial Ground
African Charter on Human and Peoples’ Rights
African Charter on Human and Peoples’Rights
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