单项选择题 Shipping society approved buoyant work vests are considered to be items of safety equipment and may be worn by members of the crew（）.

单项选择题 Prior to each voyage the master of every ship shall ensure that the intended route from the port of departure to（）is planned using adequate and appropriate charts and other nautical publications necessary for the intended voyage.

单项选择题 Orders of the Master to the officer of the watch which s/he must comply with are（）.