A vessel is proceeding from a very cold climate to a warm climate.With a cargo of non-hygroscopic nature，which of the following is correct?（）.
A. There is danger of heavy cargo sweat if outside air is introduced by ventilation
B. Danger of the ship sweat exists.Constant and vigorous ventilation is required
C. There is little danger of ship's sweat;slight possibility of cargo sweat
D. The possibility of any ship or cargo sweat is remote
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