其部分原因是涡轮螺旋桨飞机结构坚固，部分原因是“空中拖拉机”公司生产的油箱有多层橡胶密封，一旦子弹射穿油箱，橡胶层就会自动封闭住弹孔，减缓燃油的渗漏。
In part this is because of the turboprops' robust design, and in part because Air Tractor's fuel tanks have rubber membranes which close around bullet holes to slow leaks.
它包括电解质膜、硅橡胶密封圈、多孔阳极板，及在所述电解质膜和多孔板之间的自由铺放的方式形成的催化剂颗粒层。
It includes electrolyte membrane, silicone rubber seal ring, multihole anode plate, and free lay mode formed granules of catalyst layer between said electrolyte membrane and multihole plate.
隔热套、耐火纤维层和耐热橡胶层组成，制成封闭环状密封圈。
The seal ring consists of a heat insulation sleeve, a refractory fiber layer and a heat-resistant rubber layer, and is made into a sealed circular shape.
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