The fracture strength of rectangular plate with inclined crack is analyzed considering two failure modes of elastic fracture and fullyplastic failure respectively.
对具有中心穿透斜裂纹在弹性断裂和完全塑性断裂两种破坏模式下的断裂强度进行了分析。
2
Always use a plastic lid, not fully covered, to keep the water in the food.
为了保持食物中的水分，记得要用一个塑料盖子，但不要全部盖上。
3
PepsiCo announced that it had developed the world’s first bottle to be made entirely of a plastic consisting of plant-based materials, which can be fully recycled.