第九节潮汐.doc

潮汐 1、______ is not a type of tide． A．SEMIDIURNAL B．DIURNAL C．MIXED D．OSCILLATING 2、A wave entering ______ is likely to produce bores． A．shallow water B．deep water C．river D．tide 3、In which month will the equatorial counter current be strongest ________． A．January B．April C．August D．October 4、Neap tides occur ______． A．At the start of spring，when the Sun is nearly over the equator B．Only when the Sun and Moon are on the same sides of the Earth and are nearly in line C．When the Sun and Moon are at approximately 90° to each other，as seen from the Earth D．When the Sun，Moon，and Earth are nearly in line，regardless of alignment order 5、Neap tides occur only ______． A．at a new or full Moon B．when the Sun，Moon，and Earth are in line C．at approximately 28-day intervals D．when the Moon is at quadrature 6、Neap tides occur when the ______． A．Moon is in its first quarter and third quarter phases B．Sun and Moon are on opposite sides of the Earth C．Moons declination is maximum and opposite to that of the Sun D．Sun and Moon are in conjunction 7、Priming of the tides occurs ______． A．at times of new and full Moon B．when the Earth，Moon，and Sun are lying approximately on the same line C．when the Moon is between first quarter and full and between third quarter and new D．when the Moon is between new and first quarter and between full and third quarter 8、River currents tend to ______． 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 9、Spring tides are tides that ______． 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 10、Stand of the tide is that time when ______． A