In a traffic separation scheme， when joining a traffic lane from the side， a vessel shall do so（）

In a traffic separation scheme， when joining a traffic lane from the side， a vessel shall do so（）
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
正确答案：at as small an angle as possible