单项选择题
A.only in case of an emergency or to engage in fishing within the zone
B.as nearly as practical at right angles to the general direction of traffic flow
C.at as small an angle as possible
D.only to anchor within the zone
单项选择题 Systems of inbound and outbound lanes to promote the safe flow of vessel traffic in certain areas around the world are known as（）.
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（）.