【单选题】【消耗次数：1】
当空气中水汽含量达到饱和时（）。
①
露点温度与干球温度相等
②
相对湿度较大
③
绝对湿度与水汽压数值相等
④
实际水汽压较大
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饱和水汽压的变化是（）。
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随温度升降的改变量，在高温时比低温时大些
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随大气中水汽的增加而迅速增大
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随着温度的升高而迅速增大
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