| 摘要 |
A seal stack (50) includes one or more first seals (40a, 40b) that are adapted to seal in at least a first range of temperatures. The seal stack (50) also includes a second seal (52) that is adjacent to at least one of the first seals (40a). The second seal (40b) is adapted to seal in at least a lower range of temperatures than the first range of temperatures. |
