單項選擇題

Cirrus clouds are composed primarily of（）.

A.ice crystals
B.water droplets
C.snow crystals
D.nitrogen

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單項選擇題

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

A.elevation
B.temperature
C.wind speed
D.latitude

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