Keep clear（）the buoy. to。 on。 of。 for。
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In the International Code of signals，a group of three letters indicates（）. urgency or an emergency。 the vessel's national identity signal。 a group from the general signal code。 a group from the medical signal code。
In battery charging rooms，ventilation should be provided（）. at the lowest point。 near the batteries。 at the highest point。 only when charging is in progre。
If passengers are on board when an abandon ship drill is carried out，they should（）. take part。 watch。 go to their quarters。 stay out of the way and do what they want。
In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）
