Freeing ports on a vessel with solid bulwarks（）.<br>A:prevent stress concentration in the bulwark<br>B:permit easy jettison of deck cargo in an emergency<br>C:provide openings through the bulwarks for mooring lin<br>D:allow water shipped on deck to flow off rapidly

Freeing ports on a vessel with solid bulwarks（）.
A:prevent stress concentration in the bulwark
B:permit easy jettison of deck cargo in an emergency
C:provide openings through the bulwarks for mooring lin
D:allow water shipped on deck to flow off rapidly

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