A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland
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A.fetch
B.distant winds
C.local storms
D.the pull of the moon
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
A.when the moon is new or full
B.when the moon and sun have declination of the same name
C.only when the moon and sun are on the same sides of the earth
D.at the beginning of spring when the sun is over the equator
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 side of the Earth and 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，in any order
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
最新試題
The two most effective generating forces of surface ocean currents are（）.
Neap tides occur（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
A wave entering（）is likely to produce bores．
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）
The set of the current is the（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
The term flood current refers to that time when the water（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.