单项选择题 To improve your vessel’s stabilty in a hazardous situation, you should（）.

单项选择题 Upon the survey it is found the deck control valve of the fore peak tank could not be（）.

单项选择题 Upon underwater detection, there were no apparent defects on the bottom plates, bilge keels,rudder and propeller of the said vessel. This kind of wording usually appeared on（）.