单项选择题
A.Land first sighted when vessel approaching from seaward
B.Land last sighted when vessel leaving from a port
C.in sight of one another when vessel underway
D.in sight of an island during a ship on her voyage
单项选择题 The rules state that vessels may depart from the requirements of the Rules when（）.
单项选择题 The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel（）.
单项选择题 The court has the power to（）the time for commencing arbitration proceedings if it is of the opinion that in the circumstances of the case undue hardship would otherwise be caused.