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gen. preamplification
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oil preamplification
前置 放大: 66 phrases in 18 subjects
Air defense4
Automobiles2
Aviation4
Business1
Communications1
Earth sciences1
Electronics6
General4
Geophysics1
Information technology1
Nuclear physics1
Oil / petroleum5
Radio1
Shipbuilding1
Space5
Sports1
Technology24
Telecommunications3