combined echo ranging echo sounding

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1.	组合回声测距与测深航海及海... ... combined echo ranging echo sounding 组合回声测距与测深 combined echo-ranging echo-sounding 回声测距与 … www.zftrans.com
2.	统一的回声测距与测深 ... · =Combined Echo Ranging Echo Sounding 统一的回声测距与测深 · =Centre for Environmental Studies 环境研究中心[英] ... www.poptool.net