inlet manifold
进口管汇
进气歧管
进气总管
进入歧管
进气岐管
进口阀箱
下集气管
进气管
center line of bolt hole
self-drilling injected hole bolt
effective diameter of bolt or high-strength bolt
A shrinkage method combining with medium-length hole and shallow hole
hole by hole blasting technique
hole by hole detonating
hole by hole initiating
hole by hole initiation
mid-and-deep hole combining shallow hole balsting