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生态趋势研究
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生态趋势研究
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生态趋势研究
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ecological trend study
生态趋势研究
连续观察目标人群中某因素平均暴露水平的改变和某种疾病的发病率、死亡率变化的关系,了解其变动趋势;或者通过比较暴露水平变化前后疾病频率的变化情况,来判断两者间关系的群体研究。
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ground source heat pump air-conditioner
ground source heat pump heating
ground spectrometer
ground state
ground state degeneracy polymer semiconductor
ground-state depletion effect
ground state depletion microscope
ground state energy
ground state of atom
ground state rotational band
ground state spontaneous fission
ground-state spontaneous fission
ground station
ground-structure method
ground subsidence induced by dewatering of foundation pit engineering
ground subsidence survey
ground substance
ground support equipment
ground support vehicle
ground tea
ground term
ground test and launch control system
ground test for separation system under thermal circumstance
ground test of airborne weapon fire control system
ground timing system
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