...利用变化;安塞县 [gap=13184]ecosystem services function;croplandconversion; land use and land cover change; Ansai county ...
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On September 5, 1944, when making charcoal in Ansai County, northern Shaanxi, he was killed by the sudden collapse of a kiln.
1944年九月五日在陕北安塞县山中烧炭，因炭窑崩塌而牺牲。
On September 5, 1944, when making charcoal in the mountains of Ansai County, northern Shensi, he was killed by the sudden collapse of a kiln.
1944年九月五日在陕北安塞县山中烧炭，因炭窑崩塌而牺牲。
Methods We collected randomly 269 serum samples among 0-39 years healthy population and detected the polio neutralizing antibody in Ansai County.
方法随机抽样确定安塞县0~39岁人群269名，采集血清标本，检测脊灰抗体。
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