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Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this, you should（）.
A:install shoring so the the shoring supports the damaged bulkhead without pushing on them
B:install shoring so that it pushes on the damaged bulkhead while supporting it
C:use jacks or chain falls to remove the set before installing shores
D:place sandbags by the bulkhead without installing shores

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出自：海船船员证

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