A、A.as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small droplets B、B.as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming clouds C、C.dry air compresses moisture from the atmosphere into clouds D、D.when the relative humidity of the atmosphere is low

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第7题

[单选题] A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）

A、decrease B、increase C、decrease to zero D、remain unchanged

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第8题

[单选题] For H2S detection，sensitized tapes indicate H2S presence by means of discoloration of an exposed spot on the tape. The shade of the color on the spot depends upon the concentration of H2S and（）.

A、air temperature at the time of the exposure B、air pressure at the time of the exposure C、humidity at the time of exposure D、duration of the exposure

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第9题

[单选题] The error in the measurement of the altitude of a celestial body，caused by refraction，increases as the（）.

A、horizontal parallax decreases B、observer's height above sea level increases C、humidity of the atmosphere decreases D、altitude of the body decreases

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