Objective To assess the ultrsonography for the diagnosis of emergency of obstetric and gynecological diseases.
目的探讨超声对妇产科常见急诊的诊断价值。
The Design and Application of a Downhole Cartridge Simulator with Ultrsaonic Frequency Spectrum for the Well Cementation Quality Control Equipment.
超声频谱固井质量检测系统下井仪模拟器的设计
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