“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	direct-arc furnace direct-band-gap semiconductor direct bearing direct-bonded bearing direct broadcasting satellite system direct broadcast radio satellite direct cell direct-chill casting direct code direct command guidance direct connect direct-connected direct connect modem direct-contact condenser direct control direct control function direct cost direct-coupled direct-coupled amplifier direct-coupled FET logic direct-coupled transistor logic direct coupling direct current direct-current amplifier direct-current circuit

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