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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

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單項(xiàng)選擇題

Normally the mariners care more about the（）of tide.

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

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

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