单项选择题
Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.
A.stuffing box
B.propeller boss
C.seacock
D.stop-water
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Where a charter-party states that a claim will be barred unless the claimant appoints an arbitrator within a specified period，the nominated arbitrator must be actually（）within that period that has been appointed.
A.informed
B.performed
C.deformed
D.reformed -
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Where a charter-party stated that errors of navigation were excluded，it was held that these words referred to non-negligent errors，and（）not wide enough to embrace negligent errors.
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A.is always effective immediately
B.includes a statement of each condition requiring corrective action
C.must be in writing before it takes effect
D.All of the above
