单项选择题 In determining that the（）of the navigational watch is adequate to ensure that a proper look-out can continuously be maintained，the master shall take into account all relevant factors.

单项选择题 If in any doubt as to the pilot’s actions or intentions，the officer in charge of the navigational watch shall（）.

单项选择题 If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place,（）.