| 单词 | air course |
| 释义 | > as lemmasair course air course n. Mining a passage for ventilation in a mine; cf. airway n. 1. ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > ventilation passages or openings througher1645 thirling1686 air-pit1709 horse-head1747 sollar1778 airway1800 wind-hole1802 bearing door1813 air course1814 downcast shaft1814 upcast shaft (or pit)1816 buze1823 air road1832 raggling1839 thirl1847 brattice1849 intake1849 run1849 trapdoor1849 skailing1850 return1851 wind-road1860 breakthrough1875 wind-way1875 breast1882 cross-heading1883 skail-door1883 U.C.1883 undercast1883 vent1886 furnace-drift1892 the world > matter > gas > air > fresh air > [noun] > supplying fresh air or ventilation > ventilator > passage, shaft, duct, or pipe > in a mine througher1645 thirling1686 air-pit1709 airway1800 wind-hole1802 air course1814 buze1823 air road1832 raggling1839 air heading1841 thirl1847 run1849 wind-road1860 wind-way1875 1814 R. J. Griffith Geol. & Mining Rep. Leinster Coal District 58 The first operation is the cutting a passage or air course between the pits. 1937 Times 6 Feb. 8/5 Work on 14's face should have been stopped at least until a return air-course, far removed from the intake and leading directly to the main return, had been made. 1997 Mining Mag. (Nexis) Dec. 348 In US coal, the regulations require specific ventilation standards that include..less than 2% methane in all air courses and less than 1% methane at the face. < as lemmas |
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