Experiments in Tangshan area demonstrated that PHV works efficiently and stable, and has advantages over other non-explosive seismic source.

PHV在唐山地区的实验结果证明它能够稳定、有效的工作，而且优于其它非爆炸性震源。

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Experiments in Tangshan area demonstrated that PHV works efficiently and stable, and has advantages over other non-explosive seismic source.

PHV在唐山地区的实验结果证明它能够稳定、有效的工作，而且优于其它非爆炸性震源。

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