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回声测距
acoust. echo-ranging
oil echo ranging
tech. echo ranging (法); echo-ranging detection (法)
回声测距〔定位〕
gen. echo-ranging
回声测距
commun. echo ranging
回声测距【定位】
geophys. echo ranging
回声 测距: 30 phrases in 9 subjects
Agriculture1
Aviation1
Earth sciences4
Electronics1
Explosives and Explosive Ordnance Disposal2
Geophysics2
Navigation2
Oil / petroleum4
Technology13