A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day
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The apparent wind can be zero when the true wind is from（）.
Advection fog holds longest over which portions of the lakes?（）
The direction of the southeast trade winds is a result of the（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
The height of a wave is the vertical distance（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
A tide is called diurnal when（）.
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（）.