A.wingdam B.towhead C.cutoff D.landwall
A.stars B.Moon C.Sun D.Planets
A.Pick up speed where the channel widens B.Run slower in the center of the channel C.Hug the inside of a bend D.Cause the greatest depth of water to be along the outside of a bend
A.SEMIDIURNAL B.DIURNAL C.MIXED D.OSCILLATING
A.vary B.variable C.variably D.variability
A.exhibits a change in magnitude B.has a changing declination C.is increasing in SHA D.is also known as a red giant
A.speed of the current at a particular time B.maximum speed of the current C.direction from which the current flows D.direction in which the current flows
A.at elongation angles near 180° B.from quadrature to opposition C.at conjunction D.at opposition
A.White buoy with a green top B.White and international orange buoy C.Yellow buoy D.Yellow and black vertically-striped buoy
A.submerged rock，not dangerous to navigation B.sunken wreck，not dangerous to navigation C.towed-under buoy D.All of the above
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