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The International Standard Atmosphere (ISA) at sea level is defined as:
A.
15°C, 29.92 in Hg, and a lapse rate of 2°C per 1,000 feet
B.
0°C, 29.92 in Hg, and a lapse rate of 3°C per 1,000 feet
C.
15°F, 30.00 in Hg, and a lapse rate of 3.5°F per 1,000 feet
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