Which statement concerning sweat damage in containers is TRUE?（）.
A. Sweat damage in containers is unusual due to the small enclosed volume of air
B. In general，containerized hygroscopic cargoes are the only ones subject to sweat damage
Containers should be ventilated，dehumidified，or the contents physically protected against sweat damage
D. Sweat damage is not a problem except in insulated and refrigerated container
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