ballast rod


  • 翻译:冲唤钻杆

同义词

1)ballast rod,冲唤钻杆2)chisel bit,冲唤钻头3)churn drilling,冲唤钻进4)percussive machine drilling,冲唤钻眼5)thrust borer,冲唤钻机6)boring with line,钢绳冲唤钻进

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