单项选择题
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）
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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相关考题
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单项选择题
Generally speaking，a ship steaming across the North Pacific from Japan to Seattle is likely to experience（）.
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 -
单项选择题
Currents are（）in rate and direction.
A.vary
B.variable
C.variably
D.variability -
单项选择题
Current refers to the（）.
A.vertical movement of the water
B.horizontal movement of the water
C.density changes in the water
D.None of the above
