A.January
B.April
C.August
D.October
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A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
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
最新試題
Spring tides are tides that（）.
The two most effective generating forces of surface ocean currents are（）.
Water may boil up around the stern of a vessel in a channel due to（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
Tropic tides are caused by the（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
（）is not a type of tide.
The Benguela Current flows in a（）.