A.when the wind is against you
B.with the current setting against you
C.at slack water
D.with a cross current
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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
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
最新試題
The velocity of the current in large coastal harbors is（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
River currents tend to（）.
A wave entering（）is likely to produce bores．
Tropic tides are caused by the（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
Water may boil up around the stern of a vessel in a channel due to（）.
Tide is（）in direction ENE.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
The speed of an ocean current is dependent on（）.