单项选择题
A.A prohibition from loading a cargo from a country when the cargo may be a carrier of infectious diseases
B.Arrest of a vessel by legal authorities to satisfy claims through exercise of a maritime lien
C.Damage caused by riot of the population of a port
D.Losses caused by fines from polluting the harbor after malfunction of a piping system
单项选择题 Vessels lying afloat at buoys for more than 24 hours should use anchor chain for（）and insurance wire for（）.
单项选择题 The wooden plug inserted in the vent of a damaged tank should be removed if you are going to （）.
单项选择题 The two courses of action if the underwater hull of a ship is severely damaged are to plug the openings and to（）.