短語(yǔ)詞組短語(yǔ)workable coal reserves 煤的可採(cǎi)儲(chǔ)量workable mine reserves 鑛井可採(cǎi)儲(chǔ)量workable surface mine reserves 露天鑛可採(cǎi)儲(chǔ)量 返回 workable reserves