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【简答题】
以抛物线y 2 =4x的焦点为圆心、2为半径的圆，与过点A（-1，3）的直线l相切，则直线l的方程是 ______．
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【单选题】Inform Shanghai coast radio station of the destination of the vessel survivors
A.
Shanghai coast radio station shall be informed of the name of the vessel with survivors
B.
Shanghai coast radio station shall be informed of the call sign of the vessel with survivors
C.
Shanghai coast radio station shall be informed of the destination of the vessel with survivors
D.
Shanghai coast radio station shall be informed of the number of survivors on the vessel
【单选题】Where are the operational details of the coast radio stations一for public correspondence?
A.
) Admiralty List of Radio Signals, Volume lll
B.
Admiralty List of Radio Signals, Volume I
C.
ITU Radio Regulations.
D.
List of Coast Stations and Special Service Stations.
【单选题】Inform Shanghai coast radio station of the name of the vessel survivors
A.
Shanghai coast radio station shall be informed of the name of the vessel with survivors
B.
Shanghai coast radio station shall be informed of the call sign of the vessel with survivors
C.
Shanghai coast radio station shall be informed of the destination of the vessel with survivors
D.
Shanghai coast radio station shall be informed of the number of survivors on the vessel
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