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化学法测流
在测验河段的上游断面注入一定浓度的示踪剂,经水流充分混合后,在下游取样断面测定稀释后示踪剂浓度或稀释比率的流量测验。
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ancient Chinese personal ornaments
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ancient Chinese steels of cast iron decarburized in liquid state
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Ancient Cities in Ussuriysk
Ancient Cities of Chengdu Plain
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