A.Falkland Current B.Brazil Current C.Norway Current D.Benguela Current
A.by B.with C.on D.in
A.temperature and salinity differences in the water B.wind and density differences in the water C.water depth and underwater topography D.rotation of the Earth and continental interference
A.directional current B.forward current C.propeller current D.wake current
A.interruption of the normal current flow by the footing B.elevating in mud-slide zones C.penetrating rapidly through a hard crust into weaker soils D.extracting legs from soils with high cohesion
A.dike B.revetment C.cutoff D.crib
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.have lows lower than normal and highs higher than normal B.have lows higher than normal and highs lower than normal C.are unpredictable D.occur in the spring of the year
A.north B.east C.southwest D.northwest
A.the vertical rise or fall of the tide has stopped B.slack water occurs C.tidal current is at a maximum D.the actual depth of the water equals the charted depth