在晚秋或寒冬,用人造烟幕来防御霜冻的原理是 A.增强太阳短波辐射

在晚秋或寒冬,用人造烟幕来防御霜冻的原理是

A.增强太阳短波辐射  B.增强大气逆辐射作用

C.增强大气对太阳辐射的散射作用  D.增强大气对太阳辐射的反射作用

答案

B


解析:

此题考查大气的热力作用。

霜冻多发生于晚秋或寒冬晴朗的夜晚,因为晴朗的夜晚大气逆辐射比较弱,所以容易出现霜冻。因此用人造烟幕增强大气逆辐射可以有效防御霜冻。

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