【建筑】采矿机，采矿【运输】采矿机器

工程师检查采矿机的发动机是否有肚子痛。

mining industry

rotary-drilling machine with coupling (hitch) for mining

mining

mining engineering

massive deposit mining method【矿】

spreader boom (spreader jib) open-pit mining

trucks cutter loaders for mining

block caving coal mining method【矿】