单项选择题
A.merchant vessel reporting systems
B.traffic separation schemes
C.collision avoidance fairways
D.restricted maneuverability channels
单项选择题 The outer limit of the Traffic Separation Schemes is（）adjustment as necessary to complywith the port regulations.
单项选择题 There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic separation schemes. One of these is a vessel（）.
单项选择题 Traffic separation schemes established by the International Maritime Organization（）.