单项选择题

A.nimbostratusB.stratusC.cirrocumulusD.cumulonimbusThe ……

The form of cloud often known as mackerel sky which is generally associated with fair weather is（）.

A.nimbostratus
B.stratus
C.cirrocumulus
D.cumulonimbus

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热门试题

单项选择题The fog produced by warm moist air passing over a cold surface is called（）.

A.conduction fog
B.radiation fog
C.frontal fog
D.advection fog

单项选择题The belt of light and variable winds between the westerly wind belt and the northeast trade winds is called the（）.

A.subtropical high pressure belt
B.intertropical convergence zone
C.doldrum belt
D.polar frontal zone

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

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