半圆形β摄谱仪
semicircular beta spectrograph
半圆形沉积层
semi-cylindrical alluvial valley
半圆形沉箱结构
semi-circular caisson structure
半圆形动态交锁髓内钉
Semicircular dynamic locked intramedullary nail
半圆形钢板渡槽
semi-circular sheet steel flume
半圆形钢质滚轮
half spherical steel bobbin