A.at the start of spring，when the Sun is nearly over the equator
B.only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C.when the Sun and Moon are at approximately 90°to each other，as seen from the Earth
D.when the Sun，Moon，and Earth are nearly in line，regardless of alignment order
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A.January
B.April
C.August
D.October
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
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A wave entering（）is likely to produce bores．
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（）.
River currents tend to（）.
Neap tides occur only（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
The speed of an ocean current is dependent on（）.
Tide is（）in direction ENE.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
The tide is（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.