單項選擇題An anemometer on a moving vessel measures().

A.apparent wind speed only
B.true wind speed and true wind direction
C.true wind speed only
D.apparent wind speed and true wind direction


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1.單項選擇題Altocumulus clouds are defined as().

A.high clouds
B.middle clouds
C.low clouds
D.vertical development clouds

2.單項選擇題Above-normal tides near the center of a hurricane maybe caused by the().

A.high barometric pressure
B.jet stream
C.storm surge
D.torrential rains

3.單項選擇題A very light breeze that causes ripples on a small area of still water is a().

A.cat's paw
B.hog's breath
C.williwaw
D.chinook

4.單項選擇題A thin,whitish,high cloud popularly known as mares tails is().

A.altostratus
B.stratus
C.cumulus
D.cirrus