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
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
The velocity of the current in large coastal harbors is（）.
The set of the current is the（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
Which statement is TRUE concerning equatorial tides（）.
A wave entering（）is likely to produce bores．
Tropic tides are caused by the（）.
You are anchoring in a river where the current is from one direction only.The best way to lay out two anchors is to have them（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.