An aneroid barometer reading should be corrected for differences in（）.

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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Altocumulus clouds are defined as（）.

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

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