单项选择题 In order for a vessel to be engaged in fishing she must be（）.

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（）.