A.Ocean Passages for the World B.Admiralty List of Radio Signals C.IALA Maritime Buoyage System D.Admiralty List of Lights and Fog Signals
A.Isothermal B.Millibars C.Isobars D.Seismics
A.ALRS B.ALL C.AMC D.ATT
A.Ocean Passages for the World B.Symbols and Abbreviations used on Admiralty Charts，Chart 5011 C.Weekly Admiralty Notices to Mariners D.The Mariners Handbook
A.under tow B.fixed to the seabed C.underway D.All of the above
A.Ocean Passages for the World B.Admiralty Tidal Stream Atlases C.Admiralty Manual of Tides D.Admiralty Tidal Handbooks
A.on the prime vertical B.on the celestial horizon C.at lower transit D.on the Greenwich meridian
A.on an even keel B.listing about 1° to the side the light is displayed on C.listing over 5° With the light displayed on the high side D.listing，and the chutes should be directed to the side where the light is displayed
A.cutting the straps that enclose the container B.removing the rubber sealing strip from the container C.loosening the turnbuckle on the securing strap D.pushing the button on the hydrostatic release
A.fix B.running fix C.estimated position D.dead-reckoning position
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