Which of the following statements regarding deterioration of steel at elevated temperatures is MOST accurate?

A) Typical fires generate enough heat to melt steel.
B) Some degree of failure of unprotected steel should be anticipated with temperatures of a typical fire.
C) Steel loses its strength quickly at a temperature of 1000°F (538°C).
D) Failure of unprotected steel depends solely on the intensity of the exposing fire.

B

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In epidemiology, we refer to existing cases of disease as incidence, and new cases of disease as prevalence.

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