The plane plate body and the case body are made of plastic material.
平面板体和箱体由塑料制成。
Improvements are introduced containing: material selection, structural design, manufacturing process and layout of supporting points of plane plate.
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。
The relationship of crack growth rate between lateral notch specimen and plane plate specimen was studied in this paper. A formula for the relationship was established.
主要研究侧槽试样与平板试样裂纹扩展速率之间的关系，并建立了两者关系的效学表达式。
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