hammer sinker

同义词释义

1)hammer sinker,凿井用凿岩机2)sinker drill,凿井用凿岩机3)shaft sinking,凿井4)well drilling,凿井5)pit sinking,凿井6)schaft sinking,凿井7)shafting,凿井8)special shaft sinking,特殊凿井9)sinking hoist,凿井绞车10)freezing sinking,冻结凿井