The planeplate body and the case body are made of plastic material.
平面板体和箱体由塑料制成。
2
Improvements are introduced containing: material selection, structural design, manufacturing process and layout of supporting points of planeplate.
文中对平板材料的选择，结构设计，制造工艺和支承方法的改进进行了论述。
3
The relationship of crack growth rate between lateral notch specimen and planeplate specimen was studied in this paper. A formula for the relationship was established.