Air circulation is caused or affected by（）.<br>A:the rotation of the earth on its axis<br>B:convection currents caused by differences in radiant heating between equatorial and polar regions<br>C:mountain ranges<br>D:All of the above

Air circulation is caused or affected by（）.
A:the rotation of the earth on its axis
B:convection currents caused by differences in radiant heating between equatorial and polar regions
C:mountain ranges
D:All of the above

出自：海船船员证

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