A.high relative humidity
B.frequent showers and thunderstorms
C.steep pressure gradients
D.frequent calms
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A.steady，constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity
A.high winds
B.high overcast clouds
C.calm or light winds
D.fog or steady rain
A.north to south
B.south to north
C.east to west
D.west to east
A.3 times the depth of water
B.6 times the depth of water
C.10 times the depth of water
D.15 times the depth of water
A.pull the unit in the same direction that the weather is pushing it
B.pull the unit in the opposite direction that the weather is pushing it
C.tend to keep the unit on its original location over the well head
D.affect the unit's draft and inclination as maximum mooring tensions are reached
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In the Northern Hemisphere，when the wind at your location is northerly，the low pressure center causing the wind is located to your（）.
The doldrums are characterized by（）.
In the Northern Hemisphere a wind is said to veer when the wind（）.
In the Northern Hemisphere，if your vessel is in a hurricane’s navigable semicircle it should be positioned with the wind on the（）.
The wind is（）and decreasing.
When a tornado moves over the water from land it is called a（）.
In regions near the poles，the winds are generally described as（）.
Tropical cyclones are classified by form and intensity.Which system does not have closed isobars（）.
Which of the following is not a wind（）.
Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.