短語(yǔ)詞組短語(yǔ)steel -ball facies inspection 鋼球外觀檢騐Steel -ball coal pulverizer 鋼球磨煤機(jī)double steel -ball extrusion 雙珠式擠壓Nonoil steel -ball hard grinding fluid 無(wú)油鋼球硬磨液 返回 steel ball