The determination of the height of the transmissive fracture belt has been a key point for underwater coal mining. There are no precise methods and major research methods up to the present.
导水裂隙带高度的确定是水下采煤工作之重点，目前并没有一个完全可以精确确定的方法。
2
It installs the adjustable height device, high tension training belt and strengths the protection disposition. Pure organization structure not needing the power. Use safely.