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分级系统
oil hierarchy system
plast.surg. grading system
telecom. hierarchical system
分级 系统
: 58 phrases in 18 subjects
Advertising1
Agriculture1
Aviation1
Drilling1
Earth sciences3
Economy1
Electronics7
Forestry3
Information technology3
Mathematics1
Metallurgy1
Name of organization1
Refrigeration2
Rowing1
Space10
Technology17
Telecommunications3
Wind Energy1

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