| 摘要 |
1431635 Rearing crustacea RHONE-PROGIL 19 June 1974 [22 June 1973] 27161/74 Heading A1A An underwater habitat is prepared by depositing thermoplastic hollow partially flattened tubes upon the sea bed. The tubes may be a polymer of vinyl chloride and allow water to circulate within them and have a density of 1.2-2 gm/cc. Ash may be added to make up the density. Tube dimensions are disclosed. |
