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

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

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

单项选择题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

单项选择题A thin，whitish，high cloud popularly known as mares tails is（）.

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