A.continue B.stop C.commence D.cease
单项选择题() may not justify detention.
A.significant areas of damage or corrosion B.pitting of plating and associated stiffening in decks C.pitting of hull affecting seaworthiness or strength to take local loads D.the condition of such items as ladder ways,guard-rails,pipe coverings
单项选择题The force exerted by a propeller which tends to throw the stern right or left is called().
A.slip B.sidewise force C.rotational force D.thrust
单项选择题The fog is lifted,so()the radar.
A.close B.open C.switch off D.switch on
单项选择题The external flotation bladder of an immersion suit should be inflated().
A.only after two hours in the water B.only after four hours in the water C.before entry into the water D.upon entry into the water
单项选择题The dumping of refuse in a lock is permitted().
A.when approved by the lockmaster B.when locking downbound C.at no time D.during high water only