Air leak and dust pollution in ore drawing through long pass in underground mine threaten the underground prodution safety.
地下开采矿山高溜井卸矿过程中的漏风及粉尘污染威胁矿山井下的安全生产。
The result indicates that the practice method of hearing and vision signal feedback is much better than that of hearing signal feedback in the teaching effect of long pass.
实验结果表明，听觉加视觉信号反馈的练习方法对长传球准确性的教学效果要好于听觉信号反馈的练习方法。
The result indicates that the practice method of hearing and vision signal feedback is much better than that of hearing signal feedback in the teaching effect of long pass.
实验结果表明，听觉加视觉信号反馈的练习方法对长传球准确性的教学效果要好于听觉信号反馈的练习方法。
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