MATTE BLACK FINISH: Rollator plastic knob has a durable matte black coating.This finish won’t wear over time and provides sufficient texture for gripping. ZINC-PLATED STEEL: Bolts and washers ...
Tunneling in sandy dolomite strata often faces hazards such as collapse, water inrush, and water–sand inrush, seriously threatening the safety of tunnel construction. There are currently limited ...
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