A.can always rely on a buoy to be on station B.can always rely on a buoy to show proper light characteristics C.should assume a wreck buoy is directly over the wreck D.should never rely on a floating aid to maintain its exact position
A.dike B.revetment C.cutoff D.crib
A.water depth exceeding 100 feet B.fetch C.wind's velocity D.duration of the wind
A.at apogee B.new C.full D.All of the above
A.Falkland Current B.Brazil Current C.Norway Current D.Benguela Current
A.bottom contour only up to depths of 100 fathoms B.depth underneath the keel against a time base C.contour of the bottom against a distance base D.depth of water against a distance base
A.Moon is in its first quarter and third quarter phases B.Sun and Moon are on opposite sides of the Earth C.Moon's declination is maximum and opposite to that of the Sun D.Sun and Moon are in conjunction
A.4 minutes B.8 minutes C.12 minutes D.16 minutes
A.superior conjunction B.inferior conjunction C.opposition D.None of the above; the elongation will never be zero
A.a hard sand shoal marked with a light B.completely submerged at all stages of the tide C.surrounded by rocks awash at low water spring tides D.a small，low，sandy islet surrounded by shoal water
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