29、在狭水道中,船舶即将通过浅水区,下列说法正确的是( )

29、 Attending a vessel, to be available in case of need( )is called ( ).

28、 To increase the distance to the vessel ahead by reducing one´s own speed is called ( ) .

27、Floating, caused by winds and current with a determinable direction is called ( ) . A. adrift B. drifting

26、 Moving of an anchor over the sea bottom to control the movement of the vessel is called ( ) . A. Dragging B. Dredging

25、 Moving of an anchor over the sea bottom involuntarily because it is no longer preventing the movement of the vessel is called ( ) . A. Dragging B. Dredging

24、A radio signal from a distressed vessel automatically directed to a RCC giving position, identification, course and speed of the vessel as well as the nature of distress is called ( ) .

23、( )is a service to ensure that essential information becomes available in time for on-board navigational decision-making.

22、 When the information requested cannot be obtained, say: ( ).

21、 Which one is not a distress , urgency or safety communication procedure might marked by? ( ))

20、“海上搜救协调中心”用下面哪个缩写表示?( )