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冻结凿井法
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冻结凿井法
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freezing shaft-sinking method
冻结凿井法
在开凿井筒前,将井筒周围含水层用人工制冷方法冻结成封闭的圆筒形冻结壁,以抵抗地压并隔绝地下水与井筒的联系,在冻结壁的保护下进行掘砌作业的特殊凿井法。
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minority
minority areas
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minority carrier admittance
minority carrier density
minority carrier emitter
minority carrier lifetime measurement
minority equity value
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minority language broadcasting
minority language dictionary compilation
Minority language information processing
minority language modernization of china
minority language planning of China
minority national ethic
minority nationality library
minority rights
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minority writing systems of China created by the western missionaries
minorization
minorized chain
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