“hanging coal”的概念、定义、翻译、参考文献-科学参考

单词	hanging coal
释义	hanging coal [`haŋ·iŋ ¦kōl] ^{MINING ENGINEERING} A portion of the coal seam which, by undercutting, has had its natural support removed.
随便看	air equivalent air escape air-exhaust ventilator air feed airfield air filter airfloat clay air flotation airflow airflow duct airflow orifice airflow pipe airflow stack effect airfoil airfoil profile airfoil section airfoil shape airfoil-vane fan airframe air-fuel mixture air-fuel ratio air furnace air gage air gap air gas

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