In high-speed aircraft flying at high altitudes, why is the cooling of – McqOptions

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1.	In high-speed aircraft flying at high altitudes, why is the cooling of the cabin required even if temperature outside is very low?
A.	Due to the absence of solar radiation
B.	To improve fuel efficiency
C.	Due to large internal heat generation
D.	Since outside pressure is very high
Answer» D. Since outside pressure is very high

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