| 摘要 |
An insulating complex having a metal case and insulating material confined in a vacuum between the inner wall and the outer wall of the case; and wherein each of the walls has a metal strip, at least one of which includes corrugations. An insulated pipe and a set of two coaxial pipes are also provided wherein the coaxial pipes are arranged as an inner pipe and an outer pipe, preferably undersea pipes for great depths.
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