单项选择题
A.RCC B.OSC C.CSS D.GPS
Moving of an anchor over the sea bottom involuntarily b...
单项选择题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
Moving of an anchor over the sea bottom to control the ...
单项选择题Moving of an anchor over the sea bottom to control the movement of the vessel defines（）.
Pan-Pan is to be used to announce（）.A.a distress messag...
单项选择题Pan-Pan is to be used to announce（）.
A.a distress message B.an urgency message C.a safety message D.a message of SMCP
