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信号地 xìnhào dì
hydroel.st. signal earth
space signal ground
信 号 地: 89 phrases in 19 subjects
Advertising2
Air defense2
Aviation5
Communications3
Construction1
Earth sciences3
Economy1
Electronics14
General3
Geophysics5
Information technology7
Oil / petroleum7
Project management1
Radio1
Rail transport4
Space4
Sports1
Technology19
Telecommunications6