您要查找的是不是：
- B级绝缘B-class insulation
- C级绝缘class C insulation
- H级绝缘浸渍漆class-H insulating impregnating varishs
- F级绝缘胶的研究The Study of the Insulating Binders of Class F
- B级钢B grade steel
- Ｆ级绝缘材料class F insulating material
- ⅢB级配料Ⅲ B materials
- B级船板钢class B shipbuilding hull steel
- 级联connection
- 校级field rank
- 英语四级English Band 4
- 自动重置N.C.系列,连接过热保护装置,两个潮气检测探头,预润滑轴承和F级绝缘。"automatic reset N.C. series connected thermal overload protection, two moisture sensing probes, prelubricated shaft bearings and class F insulation."
- 大学英语四级College English Band 4
- 一级的firstlevel
- 船级ship' classification
- 三级片third-grade film
- 无级stepless
- 级配graduation
- “B级”考试passing rate
- 两级two-stage
