defective button 中文意思是什麼
defective button
解釋
次鈕-
Because of the lower rock fragmentation efficiency and defective geometrical shape of chisel bit, sweden has replaced chisel bit with taper connecting cross chisel bit and button bit since the mid - seventies
因一字形釬頭破巖效率低和幾何形狀結構缺陷等問題,瑞典從70年代中期就用錐體連接的十字和球齒釬頭取代了一字形釬頭。
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