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pilot hole
释义
pilot hole
Encyclopedia
理学
地质钻孔
释
pilot hole
先导孔
在钻深孔或超深孔之前,在深孔或超深孔孔位附近钻的一口直径相对较小、深度相对较浅的钻孔。“双孔方案”中首先施工的钻孔。
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geometric transversal theory
geometric variable
geometric vector
geometric viewpoint
geometrisation of ore body
geometrizable
geometrization
geometrization conjecture
geometrization of gravitation
geometrized unit
geometrized units
geometrodynamics
geometrography
geometroid
geometry
Geometry and Tracking
geometry axiom
geometry deformation
geometry in the large
geometry of bundles
geometry of circles
geometry of compass
geometry of complex domains
geometry of connection
geometry of diagrams
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