单选题Chain suspension ladders on a ship must be replaced by fixed ladders if the required chain suspension ladder（）.Ahas been sent in for repairBcannot be supported against a vertical flat surfaceCdoes not extend to the water when the ship lists 15 degreesDis not equipped with vertical guard rails on either side
单选题
Chain suspension ladders on a ship must be replaced by fixed ladders if the required chain suspension ladder（）.
A
has been sent in for repair
B
cannot be supported against a vertical flat surface
C
does not extend to the water when the ship lists 15 degrees
D
is not equipped with vertical guard rails on either side
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