标志-干井环形槽围阻
Mark I drywell-torus containment
环形通风冷却器
circular type draft cooler
环形通讯系统
loop communication system
环形形变光栅
toroidally-deformed grating
矩形环形复合感应器
inductor of rectangle-cycle multiplex structure
螺旋环形通道
Spiral Ring-shaped Channel
扭转环环槽
keystone design ring groove
扭转环环槽量规
keystone piston ring groove gauge