“jack ring”的概念、定义、翻译、参考文献-科学参考

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单词	jack ring
释义	jack ring 塞孔圈
随便看	importance function importance of a flare importance sampling importance value importance weighting import and export corporation import and export licence import and export license system important important agricultural base important export crop important factor important fiber crop important food plant important meat source important resonance important spare-parts program importation import bounty import cargoes import certificate import charges import collateral import collection import commission