單項(xiàng)選擇題不同地層對(duì)電磁波信號(hào)產(chǎn)生不同程度的衰減,地層電阻率在()之間的,是最適合電磁波傳輸?shù)牡貙?/strong>

A.1-15ohms
B.2-20ohms
C.20-60ohms
D.50-100ohms


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