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The DTH hammer piston always makes direct contact with the drill bit and there is generally no loss of transmitted energy as the hammer drills deeper...
这个与本地网络有关系。如果本地网络不稳定，不管用什么加速器(jia su qi)都是无济于事的。好比(hao bi)打井抽水，水源稳定（有丰富的地下水(di xia shui)），那就能稳定的抽水。但如果水源不稳定，...