短語詞組短語magnetic telluro sounding instrument 數(shù)字大地電磁測深儀magnetic resonance sounding 磁共振測深digital magnetic telluro sounding instrument 數(shù)字大地電磁測深儀magnetic diploe frequency sounding 磁偶源頻率測深法magnetic sounding formula 磁力測深公式frequency electro -magnetic sounding 頻率電磁測深法electric or electro magnetic sounding 電測深telluric electro -magnetic sounding 大地電磁測深magnetic anomaly gradient depth sounding 磁異常梯度測深 返回 magnetic sounding