單項(xiàng)選擇題The amount and accuracy of the information provided on the different charts（）considerably.

A.varies
B.maintains
C.Shifts
D.assembles


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題Which kind of fog is also named as ground fog?（）

A.Advection
B.Radiation fog
C.frontal fog
D.Steam fog

4.單項(xiàng)選擇題Normally the mariners care more about the（）of tide.

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

5.單項(xiàng)選擇題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