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horizontal directional drilling
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horizontal directional drilling
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horizontal directional drilling
水平定向钻
将一个可调向操控的钻头连接在钻杆组的端部,用于地下水平定向钻孔的机具。是在不开挖地表面条件下,铺设多种地下公用设施(管道、电缆等)的施工设备,广泛用于供水、电力、电信、天然气、煤气和石油等管线铺设施工中。
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C* algebra
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C*-algebraic tensor product
C*-algebra representation
Caliban
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Calibration and Measurement Capability
calibration battery
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calibration curve method
calibration device of force measuring instrument
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