单项选择题
A.underway
B.using gear which extends more than 50 meters outboard
C.using a seine of some type
D.using gear which restricts her maneuverability
单项选择题 In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should（）.
单项选择题 In determining safe speed，the Rules list all of the following as factors which must be taken into account EXCEPT the（）.
单项选择题 In determining if risk of collision exists the following considerations shall be among（）.