单项选择题
Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.
A.expose any loose connections
B.demagnetize the metal elements
C.bring the pointer to its true position
D.contract and expand the glass face
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单项选择题
Pressure gradient is a measure of（）.
A.a high-pressure area
B.pressure difference over horizontal distance
C.pressure difference over time
D.vertical pressure variation -
单项选择题
On what does the operation of an aneroid barometer depend?（）
A.Thin，metal，air tight cell
B.Curved tube containing alcohol
C.Column of mercury supported by atmospheric pressure
D.Expansion of mercury in a closed tube -
单项选择题
MODERATE WAVES，TAKING A MORE PRONOUNCED LONG FORM；MANY WHITE HORSES ARE FORMED.THIS sea condition is likely to be termed（）.
A.moderate breeze
B.fresh breeze
C.strong breeze
D.near gale
