A.fetch
B.distant winds
C.local storms
D.the pull of the moon
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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
A.its velocity in knots
B.direction from which it flows
C.estimated current
D.direction toward which it flows
最新試題
()is not a type of tide.
Which current would you encounter on a direct passage from London,England,to Capetown,South Africa().
You are docking a vessel.Wind and current are most favorable when they are().
The tide().It’s 2 hours before low water,and()your present position you will be aground at low water.
The type of current which will have the greatest effect on the course made good for your vessel is().
The velocity of a rotary tidal current will be decreased when the Moon is().
Spring tides are tides that().
Which current would you encounter on a direct passage from southern Africa to Argentina,South America().
The set of the current is the().
The velocity of the wind,its steady direction,and the amount of time it has blown determines a wind driven current’s().