A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
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A.adverse currents for practically the entire crossing
B.favorable currents for practically the entire crossing
C.favorable currents in the summer months and adverse currents in the winter months
D.variable currents having no significant effect on the total steaming time
A.vary
B.variable
C.variably
D.variability
A.vertical movement of the water
B.horizontal movement of the water
C.density changes in the water
D.None of the above
A.dike
B.revetment
C.cutoff
D.crib
A.directional current
B.forward current
C.propeller current
D.wake current
最新試題
The set of the current is the（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The term flood current refers to that time when the water（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
Spring tides are tides that（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
A wave entering（）is likely to produce bores．
Water may boil up around the stern of a vessel in a channel due to（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
Tropic tides are caused by the（）.