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單項(xiàng)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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單項(xiàng)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

單項(xiàng)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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