您要查找的是不是：
- 环孔PN结loophole PN junction
- 环孔镗床(刀)annular borer
- 半环孔材semi-ring porous wood
- 环孔annular distance
- 月结monthly closing
- 中国结Chinese knot
- 环孔窗loop window
- 索结hitch
- 圆环traffic circle
- 冲孔punching
- 办结finish
- 螺孔screw
- 手环wrist strap
- 内孔endoporus
- 大块pn结bulk p-n junction
- 内环inner belt
- 人孔manhole
- 磁环magnetic ring
- PN结电容capacitance of PN junction
- 安装孔open holes
