Since 1992, the highresolution seismic explorations of working areas have been conducted successively in various mine shafts of Yongxia mining district.
1992年以来,永夏矿区各矿井相继进行了采区高分辨地震勘探。
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The JDS Uniphase HA9 PThe JDS Uniphase HA9 Programmable Attenuator is a highresolution, extended-range, programmable attenuator ideal for testing power meters and for general test and laboratory work.