单项选择题

The atmosphere in the vicinity of a high pressure area is called a(n)（）.

A.anticyclone
B.cold front
C.occluded front
D.cyclone

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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

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