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Lower the ladder two steps（） ,please !
- A、too
- B、more
- C、little
- D、few
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单选题舷梯有点儿高，我们应该降低舷梯。（）A
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be secured in a position so that it rests firmly against the ship's side from which the discharge operations are carried outB
have at least two replacement steps which are secured in position by a method different from that used in the original constructionC
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 twistingD
have steps made of softwood，or other material of equivalent properties，made in one piece free of knots，having an efficient slip surface
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