单项选择题
Freeboard is measured from the upper edge of the（）.
A.bulkwark
B.deck line
C.gunwale bar
D.sheer strake
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A.bow stem
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Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.
A.after torque causes line pull to exceed the rated capacity of the winch
B.before the line pull reaches the rated capacity of the winch
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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 shoring supports the damaged bulkheads 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
