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
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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
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?（）
Tide is（）in direction ENE.
Water may boil up around the stern of a vessel in a channel due to（）.
The set of the current is the（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Neap tides occur（）.
（）is not a type of tide.
Neap tides occur only（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The two most effective generating forces of surface ocean currents are（）.