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先拱后墙法 meaning in English

arched roof in advance of wall tunneling method

Related Words

  1. 拱
  2. 拱墙
  3. 墙拱
  4. 拱肩拱
  5. 先公后私
  6. 先公司
  7. 先共晶
  8. 先共晶奥氏体
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