Endurance cracks may appear in the hull structure at different ship-ages for some ships, especially at the vessel bottom and the longitudinal bone on board side.
有些船舶在不同的船龄阶段，在船体结构上出现疲劳裂纹，特别是在船底、舷侧纵骨中较为突出。
This paper discusses the calculated method to the unbalanced cutting power distribution in the structure of water sluice bottom board and poses the suggestion.
对水闸底板结构设计中的不平衡剪力分配计算方法进行了探讨，提出了建议。
The vacuum table has simple structure, good smoothness of the suction table bottom board and low manufacture cost.
该真空吸台结构简单、吸台底板平面度好、制作成本低。
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