单项选择题 As soon as the ship is berthed，you should lower the gangway，stretch a net（）it，and adjust it to the rise and fall of the tides so that personnel may embark or disembark in safety．

单项选择题 As operator of a 199 GT towing vessel sailing foreign，it shall be your duty to enter in the Official Logbook or other permanent record（）.

单项选择题 An offshore drilling unit must be equipped with a first aid kit approved by the（）.