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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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water soluble polymer
water soluble powder
water soluble tablet
water source areas
water source heat pump
water-source heat pump air-conditioner
water source of drinking water
water source project for irrigated grassland
water sources protection planning
water spinach
waterspout prominence
water sprinkler
water stage observation
water/steam quality criterion
water steam quality supervision
Waterston
Waterstones
water stop material
water storage
water storage and drainage engineering works built on slopes
water storage device
water storage equipment
water storage works on slope
water-storing tissue
water stress
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