形成风的直接原因是（）。 A.太阳辐射强弱差异 B.地面冷热

形成风的直接原因是（　　）。

　A.太阳辐射强弱差异　B.地面冷热不均　

C.水平气压梯度力　 D.高低空之间的空气对流

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形成风的直接原因是（ ）。 A.太阳辐射强弱差异 B.地面冷热

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形成风的直接原因是（）。 A.太阳辐射强弱差异 B.地面冷热