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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
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162 phrases
in 21 subjects
Agriculture
1
Air defense
2
Aviation
11
Business
2
Computer networks
2
Data processing
2
Earth sciences
1
Economy
1
Electronics
80
Engineering geology
2
General
2
Geophysics
1
Information technology
11
Mathematics
3
Metallurgy
1
Multimedia
2
Rail transport
1
Space
4
Sports
1
Technology
10
Telecommunications
22
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