“shaft pillar”的概念、定义、翻译、参考文献-科学参考

单词	shaft pillar
释义	shaft pillar [`shaft ´pil·ǝr] ^{MINING ENGINEERING} A large area of a coal or ore seam which is left unworked around the shaft bottom to protect the shaft from damage by subsidence.
随便看	standard project flood standard propagation standard rate turn standard reference material standard refraction standard sand standard score standard seawater standard shaft standard solution standard star standard state standard station standard subroutine standard target standard temperature and pressure standard terminal arrival route standard test-tone power standard time standard ton standard trajectory standard visibility standard visual range standard volume standard waveguide

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