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官厅水库污染事件
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官厅水库污染事件
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理学
〔环境科学事件〕
释
Guanting Reservoir pollution event
官厅水库污染事件
1971年底至1972年初发生于北京官厅水库的水污染事件。
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unramified prime ideal
unramified regular element
unramified Riemann domain
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