A.variesB.maintainsC.ShiftsD.assemblesThe amount and ac……

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

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

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

单项选择题Normally the mariners care more about the（）of tide.

A.speed
B.height
C.direction
D.course

单项选择题The International Association of Lighthouse authorities (IALA) buoyage system “A” uses some types of marks to distinguish safe navigation? Which type(s) does(do) not belong to the system?（）

A.lateral marks and cardinal marks
B.safe water marks
C.isolated danger marks and special marks
D.dangerous water marks