單項(xiàng)選擇題

Land-based authority conducting and co-ordinating search and rescue operations in a designated area defines（）.

A.RCC
B.OSC
C.CSS
D.GPS

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單項(xiàng)選擇題

Moving of an anchor over the sea bottom involuntarily because it is no longer preventing the movement of the vessel defines（）.

A.dredging ( of anchor )
B.dragging ( of anchor )
C.weighing anchor
D.walking out anchor

單項(xiàng)選擇題

Moving of an anchor over the sea bottom to control the movement of the vessel defines（）.

A.dredging ( of anchor )
B.dragging ( of anchor )
C.weighing anchor
D.walking out anchor