A.create large waves in the direction of the current
B.change direction 360°during a 24 hour period
C.remain fairly constant in direction and velocity throughout the year
D.are characterized by a light green color
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A.permanent waves
B.tidal waves
C.tropical waves
D.tropical storms
A.starboard bow，note the course，and head in that direction
B.starboard quarter，note the course，and head in that direction
C.port quarter，note the course，and head in that direction
D.port bow，note the course，and head in that direction
A.veering wind
B.backing wind
C.reverse wind
D.chinook wind
A.starboard bow and make as much headway as possible
B.starboard quarter，and make as much headway as possible
C.port quarter，and make as much headway as possible
D.port bow，and make as much headway as possible
A.clockwise around the North Atlantic and North Pacific Oceans
B.clockwise or counterclockwise depending on whether it is warm or cold current
C.counterclockwise except in the Gulf Stream
D.counterclockwise around the North Atlantic and North Pacific Oceans
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The length of a wave is the length（）.
Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.
Radiation fog（）.
Advection fog holds longest over which portions of the lakes?（）
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.
In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream，and is called a（）.
Ocean currents are well defined and（）.
In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n)（）.
The presence of stratus clouds and a dying wind will usually result in（）.