“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	ion-cyclotron-resonance mass spectrometer ion density ion detector ion emission ion engine ion exchange ion-exchange chromatography ion-exchange electrolyte cell ion exchanger ion-exchange resin ion exclusion ion-exclusion chromatography ion fractionation ion gage ion gun ionic bond ionic charge Ionic column ionic conductance ionic conduction ionic conductivity ionic crystal ionic dissociation ionic equilibrium ionic equivalent conductance

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