Discussion
Consider the following pairs of storage structure and its characteristic:
Bag store - Easy stock identification but costly handling
Metal silo - Cheap and quick to erect but thermally responsive
Concrete silo - Thermal mass evens temperature swings
Hermetic structure - Requires continuous ventilation
How many of the pairs given above are correctly matched?
Answer: A
Correct answer: Only three
Three pairs are right. A bag store gives easy stock identification but costly handling, since every sack is moved individually; a metal silo is cheap and quick to erect but thermally responsive, following ambient swings closely; and a concrete silo's thermal mass evens those swings out.
The fourth is wrong, and reverses the principle. A hermetic structure must be sealed, not ventilated: its whole action depends on respiration depleting the oxygen inside, and any ventilation admitting fresh air would defeat it entirely.
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