“pack wall”的概念、定义、翻译、参考文献-科学参考

单词	pack wall
释义	pack wall [`pak ´wȯl] ^{MINING ENGINEERING} A wall of dry stone built along the side of a roadway, or in the waste area, of a coal or metal mine to help support the roof and to retain the packing material and prevent its spreading into the roadway.
随便看	recharge area recharge basin recharge well reciprocal reciprocal bearing reciprocal differences reciprocal ellipsoid reciprocal equation reciprocal ferrite switch reciprocal impedance reciprocal inhibition reciprocal junction reciprocal lattice reciprocal laying reciprocal leveling reciprocal ohm reciprocal ohm centimeter reciprocal ohm meter reciprocal polar figures reciprocal recombination reciprocal series reciprocal space reciprocal spiral reciprocal strain ellipsoid reciprocal theorem

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