平头型掏挖基础
plane head undisturbed soil foundation
剪绒挖花绵羊皮褥子
sheared & designed sheep skin plate
剪和挖操作
trimming and digging operation
后挖前卸式挖装机
back-hoe front end loader
构造挖矿
Ore-controlled structural system
高露头挖孔桩
belled pile with long cantilever
盖挖顺作
Covered excavation and sequential construction