| 摘要 |
<p>The conductor tube consists of at least two concentric spaced metal tubes: an inner one (2) and an outer one (4). There is an insulation layer (3) in the annular gap between them. This gap is evacuated. The outer tube is divided at a preset spacing. A pump connection (10), vacuum-tight, is fitted above each aperture and welded to the outer tube.</p> |
