On the base of the active sonar theory, This thesis provide active ultrasonic detecting system that application in low-speed moving object of short-range in shallow sea surroundings.
论文文摘本论文基于主动声纳的基本原理，提出适用于浅海环境水下近程低速目标主动声探测系统。
Manufacturing sector is divided into high-speed wire moving shop, low-speed wire moving shop, grinning shop, composing shop and CNC processing shop.
制造部门拥有快走丝车间、慢走丝车间、磨床车间、组装车间、CNC加工车间。
Hydraulic crawling is the main factor effect low speed moving performance of hydraulic cylinder.
液压爬行是影响液压缸低速运动性能的主要因素。
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