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chisel bit
bridg.constr. 冲击钻
construct. 冲击式一字形钻头
eng.geol. 冲击式一字形钻头; 扁凿钻头; 鑽頭
shipb. 冲击钻头
tech. 凿形钻头; 凿头; 单刀钻冠; 冲击式钻头; 取样钻头
chisel bit: 23 phrases in 5 subjects
Bridge construction1
Drilling3
Engineering geology5
Oil / petroleum2
Technology12