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
Which statement is TRUE concerning equatorial tides（）.
Tide is（）in direction ENE.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
Neap tides occur only（）.
Which statement is TRUE concerning apogean tides（）．
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?（）
A wave entering（）is likely to produce bores．
Water may boil up around the stern of a vessel in a channel due to（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.