单项选择题 The Convention is the first to establish basic requirements on training certification and watch-keeping for seafarers on an international level（）

单项选择题 The International Sewage Pollution Prevention Certificate shall be issued for a period specified by the Administration, which shall not exceed from the date of issue（）

单项选择题 When the ship is in restricted visibility, the officer in charge of the engineering watch shall ensure that （） Ⅰ.Bridge order relating to changes in speed or direction of operation areimmediately implemented Ⅱ.auxiliary machinery used for maneuvering is readily available Ⅲ.permanent air or steam pressure is available for sound signals