...状与展望 关键词 煤层气 定向井 U型井 钻井方案 煤储层 [gap=1663]Keywords] coalbed methane；controlled directional well；U-type well；drilling scheme；coal reservoir ...
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remote-controlled directional well drilling 遥控定向井钻进
controlled directional well drilling 遥控定向井钻进
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The Programme 64 is a high performance, low impedance directional column speaker with exceptionally well controlled and consistent directivity over the system's 200-20kHz operating range.
该方案64是一种高性能，低阻抗方向柱扬声器特别好控制和一致的方向性对系统的200 - 20kHz的工作范围。
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