It is mainly composed of sonar range finder which includes comprehensively surface instrument, subsurface equipment and different kinds of accessory.
该技术主要仪器为声纳测距仪，它包括地面仪器、井下仪器及各种辅助设备。
Petroleum and natural gas industries - Downhole equipment - Subsurface safety valve equipment.
石油和天然气工业。下降孔设备。地下安全阀设备。
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