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The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.

A. One-fourth

B. One-third

C. Two-fifth

D. One-half

Related Questions

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  2. The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.
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  18. One kilowatt-hour energy is equivalent to
  19. Locomotive boiler is a
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