(φ)75mm双管单动采煤管在薄煤层及粉煤钻探中的应用
(φ)75mm쌍관단동채매관재박매층급분매찬탐중적응용
Application of (φ)75mm Double Tube Single Swivel Mining Tube for Drilling in Thin Coal Seam and Pulverized Coal
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