When fruit is carried as refrigerated cargo，the most frequent cause of its being infected at the discharge port is（）.<br>A:leaks in the ship's refrigeration system<br>B:improper cleaning of the cargo spaces<br>C:carriage at the wrong temperature<br>D:improper precooling of the cargo spaces

When fruit is carried as refrigerated cargo，the most frequent cause of its being infected at the discharge port is（）.
A:leaks in the ship's refrigeration system
B:improper cleaning of the cargo spaces
C:carriage at the wrong temperature
D:improper precooling of the cargo spaces

出自：海船船员证

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