The ladder shall（）.<br>A:be secured in a position so that it rests firmly against the ship's side from which the discharge operations are carried out<br>B:have at least two replacement steps which are secured in position by a method different from that used in the original construction<br>C:have battens made of hardwood，or other material of equivalent properties，in one piece and not less than 1.80metres long provided at such intervals as will prevent the pilot ladder from twisting<br>D:have steps made of softwood，or other material of equivalent properties，made in one piece free of knots，having an efficient slip surface

The ladder shall（）.
A:be secured in a position so that it rests firmly against the ship's side from which the discharge operations are carried out
B:have at least two replacement steps which are secured in position by a method different from that used in the original construction
C:have battens made of hardwood，or other material of equivalent properties，in one piece and not less than 1.80metres long provided at such intervals as will prevent the pilot ladder from twisting
D:have steps made of softwood，or other material of equivalent properties，made in one piece free of knots，having an efficient slip surface

出自：海船船员证

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