| 摘要 |
<p>The cover block has a heat insulation layer (18,20) made of a material which hardens after shaping and is thinner in the area of the intermediate wall (22) of the cover (12), then in the area of the outer walls (24,26,28,30,32,34) of the cover. Thus, the central axis (36,38) of the inner wall of the heat insulation layer runs eccentrically to the central axis (40,42) of the inner wall of the cover.</p> |
