单项选择题
A.varies B.maintains C.Shifts D.assembles
When you read the sailing directions, you should notice...
单项选择题When you read the sailing directions, you should notice that this is one of a series of publications produced by the（）which should be consulted by users of Admiralty Charts.
A.UK Hydrographic Office B.IMO C.International Hydrographic Organization D.International Association of Classification society
When are you allowed to throw plastic garbage overboard...
单项选择题When are you allowed to throw plastic garbage overboard?（）
A.Being mroe than 25 miles from shore B.Only at night when it‟s dark C.Being more than 6 miles from shore D.Never
Which kind of fog is also named as ground fog?（）A.Advec...
单项选择题Which kind of fog is also named as ground fog?（）
A.Advection B.Radiation fog C.frontal fog D.Steam fog
