| CPC H05K 7/20154 (2013.01) [F04D 27/004 (2013.01); G06F 1/206 (2013.01); H05K 7/20145 (2013.01); H05K 7/20518 (2013.01)] | 27 Claims |

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1. A circuit board, comprising:
a plurality of heat-generating components arranged in rows and columns, wherein the circuit board is placed in a cooling duct with an air inlet and an air outlet, a direction from the air inlet to the air outlet is a cooling direction, and
along the cooling direction, adjacent heat-generating components in a same row include form at least five different interval lengths.
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