A.chute
B.stabilized channel
C.slough
D.navigable pass
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A.3 hours
B.6 1/2 hours
C.12 1/2 hours
D.25 hours
A.dew
B.frost
C.glaze
D.snow
A.high density will be on the left in the Northern Hemisphere
B.high density will be on the right in the Southern Hemisphere
C.low density will be on the left in the Northern Hemisphere
D.low density will be on the left in the Southern Hemisphere
A.at high vessel speeds
B.at low vessel speeds
C.in shallow water
D.in deep water
A.small whirlpool
B.smooth patch of water
C.V-shaped ripple with the point of the V pointing downstream
D.V-shaped ripple with the point of the V pointing upstream
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In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
The presence of stratus clouds and a dying wind will usually result in（）.
The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
A tide is called diurnal when（）.
The direction of the southeast trade winds is a result of the（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
The apparent wind can be zero when the true wind is from（）.
The edge of a hurricane has overtaken your vessel in the Gulf of Mexico，and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the（）.
The currents are（）mosoonal origin．
In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.