他在伦敦学习期间，学的英语免费论文网。%。
之前一些研究结果显示，免费论文的下载和被引用次数高于那些需要付费订阅的论文，霍顿的研究模型便基于这些研究。
Houghton's model relies on studies suggesting that free papers are downloaded and cited more often than papers available only by subscription.
进入栏目免费论文付费论文职称论文毕业论文转让论文论文指导外文翻译检测论文当矿井主通风机倒机时，在倒机的短暂停风时间内，高突矿井出现瓦斯超限现象。
When main ventilator of mine is switching, high outburst mines will appear over-limit phenomenon of gas concentration in short blowing-out time of switching ventilator.
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