单项选择题

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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单项选择题
Altocumulus clouds are defined as（）.

A.high clouds
B.middle clouds
C.low clouds
D.vertical development clouds
单项选择题
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
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