| 摘要 |
The arcuate hull shell section has, in its rear section (14) a narrowing formed by lowering of the upper surface (13) of the section. The upper part has a pent shaped fold (15) which can be continuous or discontinues. The narrowing can be formed by a reduction of the space between the two laterals sides of the section. The narrowing can be formed by a movable section. There can be arcuate sub-sections (17) to form one or more levels in the main arcuate section (18).
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