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leak stopping
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leak stopping
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leak stopping
堵漏
采用不同的挤堵方法,将水泥或复合化学堵剂以一定的压力和排量挤入破漏管外,并在管内留有一定长度的堵塞,从而封堵套管破漏的作业过程。
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manufactrue in Western Europe from the 16th to the 18th century
manufacture
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manufactured sand
Manufacture of Soda
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