Directing of horizontal component magnetic variometer and directional checkout are important operation to guarantee quality of record.
水平分量磁变仪定向与定向检查是保证记录质量的一项重要工作。
Directing of horizontal component magnetic variometer and directional checkout are important operation to guarantee quality of record.
水平分量磁变仪定向与定向检查是保证记录质量的一项重要工作。
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