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单词
mean life
释义
mean life
Encyclopedia
理学
原子核
释
average life; mean life
平均寿命
放射性核素所有原子的平均存活时间。对于按指数规律衰变的体系，平均寿命是放射性核素的原子核数目衰减至起始时刻的1/e所需的时间。用符号τ表示。
Physics
＞原子核物理学＞原子核衰变＞释义
mean life
平均寿命
Mathematics
mean life
平均寿命
Astronomy
mean life
平均寿命
Chemistry
＞放射化学与辐射化学＞基础放射化学＞释义
average life; mean life
平均寿命
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crop disease
crop disease and pest disasters in China
crop diseases and insect pests
crop diseases in China
crop distribution
crop domestication
crop domestication and evolution
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crop farming
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crop germplasm resourceson-farm conservation
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crop growth condition monitoring by remote sensing
crop growth model
crop growth monitoring
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crop harvest
crop insect pests monitoring
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cropland irrigation date forecast
cropland prataculture
crop nursery
crop pests
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更新时间：2026/6/21 5:56:23