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交换数字
telecom. switched digital (ISDN 等数字线上的拨号传输业务)
交换数字
: 162 phrases in 21 subjects
Agriculture1
Air defense2
Aviation11
Business2
Computer networks2
Data processing2
Earth sciences1
Economy1
Electronics80
Engineering geology2
General2
Geophysics1
Information technology11
Mathematics3
Metallurgy1
Multimedia2
Rail transport1
Space4
Sports1
Technology10
Telecommunications22