spring pole drilling是什么意思

网络释义

1)spring pole drilling,手工冲唤钻眼2)percussive machine drilling,冲唤钻眼3)hand churn drilling,手动吊绳冲唤钻眼4)chisel bit,冲唤钻头5)churn drilling,冲唤钻进6)ballast rod,冲唤钻杆