| tunnel |
A horizontal, or near-horizontal, underground passage, entry, or haulageway, that is open to the surface at both ends. A tunnel (as opposed to an adit) must pass completely through a hill or mountain.
출처: www.netl.doe.gov/coal/Coal%20Primer/glossary.html
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|---|---|
| tunnel |
An opening driven horizontally or nearly so through rock. U
출처: www.readinganthracite.com/glossary.htm
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| tunnel |
An underground passage for vehicles or pedestrians, especially one which is created by digging into earth. Occasionally, tunnel structures are built in an excavated area then covered over.
출처: pghbridges.com/termsTun.htm
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| tungsten |
When used as an alloying element, it increases the strength of steel at normal and elevated temperatures.
출처: www.niagaralasalle.com/products/reference/glossary...
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| tunnel |
in mining, a horizontal passageway that provides access to the mine
출처: www3.newberry.org/k12maps/glossary/
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