半圆型开孔防波堤
semi - circular perforated breakwater
不均匀开孔均汽板
homogeneous steam panel with nonhomogeneous ho
侧向连续开孔
Continuous Holes in Lateral Wall
大开孔
large opened
large openings
large hole
big opening
big hole
large opening
cylindrical shell with large opening
the Large Nozzles
Large nozzle
大开孔平盖
flat cover with large opening
带压开孔
Opening with Press
pressure measurement hole
hot tap
单面开孔结构
single-side holed structure
电动开孔机
electrical tapping machine