單項選擇題In reading a weather map，closely spaced pressure gradient lines would indicate（）.
A.high winds
B.high overcast clouds
C.calm or light winds
D.fog or steady rain
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1.單項選擇題In North America the majority of the weather systems move from（）.
A.north to south
B.south to north
C.east to west
D.west to east
2.單項選擇題In bad weather，what length of chain should be used with a single anchor? （）
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
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When your vessel is on or near the path of an approaching tropical storm the（）.
題型：單項選擇題
When experiencing heavy winds，you should reef sails to（）.
題型：單項選擇題
Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
題型：單項選擇題
MIST is caused by（）.
題型：單項選擇題
The wind is（）and decreasing.
題型：單項選擇題