对主动源电磁信号寻踪法做了较详细的介绍。

The methods of active source electromagnetic signal homing is described in detail.

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多频发射技术是主动源电磁法提高工作效率的重要手段之一。

Multi - frequency transmitting technology is one of the most important measures to improve efficiency for active electromagnetic method.

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传染源和宿主动物主要是猪。

The main source of infection is pig.

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