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上导洞法
archit.
bar and sill method
(隧道施工)
hydroel.st.
top drift method
met.
bar and sill method
tech.
top-heading method
(开挖隧道)
隧道施工
上导洞法
construct.
bar and sill method
上导洞 法
:
1 phrase
in 1 subject
Engineering geology
1
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