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francium
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理学
放射性元素
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francium
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天然放射性元素,元素符号Fr,原子序数87,半衰期最长的同位素的质量数223,属周期系ⅠA族,碱金属元素。为纪念发现者M.佩雷[注]的祖国法国(France)而命名。
Astronomy
francium
缩写:Fr。钫
Chemistry
>放射化学与辐射化学>放射性元素化学>释义
francium
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tropical fruit trees
tropical grass
tropical grassland resource
Tropical Grasslands-Forrajes Tropicales
tropicalized
tropical marine climate
tropical medicine
tropical meteorology
tropical monsoon
tropical monsoon climate
tropical month
Tropical Needleleaf Forest
tropical niche conservatism hypothesis
tropical ocean-atmosphere interaction
Tropical Ocean Global Atmosphere
tropical pipe
Tropical Rainfall Measuring Mission
tropical rain forest
tropical rainforest
tropical revolution
tropical savanna
tropical savanna climate
Tropical Seashore of Sanya Scenic and Historic Area
tropical shrubby tussock
tropical shrub grassland
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