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。
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。
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