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 ballasting to survival draft，while in transit，due to extreme wind and wave loads，thrusters or propulsion，if available，should be used to（）.
单项选择题 In a following sea，a wave has overtaken your vessel and thrown the stern to starboard. To continue along your original course，you should（）.
单项选择题 If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.