| 41. | Structures made of concrete can have a long service life.
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| 42. | The F-101 Voodoo suffered from this throughout its service life.
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| 43. | He recalled the full-service life, the teaching that never ended.
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| 44. | The projected service life of the tower is 250 years.
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| 45. | They are also exposed to hydrogen during their service life.
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| 46. | Does anybody know what service life is like any more?
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| 47. | The service life for a color television is 12 years.
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| 48. | "The service life of these missiles expired and has been extended, " he said.
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| 49. | However, the composition can affect service life and voltage stability.
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| 50. | "We aren't taking a single missile off combat duty before its service life expires,"
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