词汇“三级瓦斯煤矿 third category gassy mine;”的意思、用法、释义、翻译、读音、例句、短语、词组-国际大辞典

单词	三级瓦斯煤矿 third category gassy mine;
释义	见:三级: 三级瓦斯煤矿 third category gassy mine;
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