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

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

出自：海船船员证

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